So, you're saying that Moderna had a potential vaccine start testing in the same month that the pandemic was recognized as a pandemic, and Pfizer had their potential vaccine ready to start testing a month later.
Sure, sure. 
I really have to go over this chronology? So soon?
1. News of the SARS-Cov-2 (as it has come to be known)
outbreak was leaked to the world out side of China on December 31, 2019.
2. The DNA sequence was communicated (leaked?) to the world out side of China on January 11, 2020.
IOW, by early January the world knew the SARS-Cov-2 virus was a serious threat to spread worldwide. US government (under Trump's Presidency) responded proportionally:
January 4, 2020 - CDC Director Robert Redfield offers to send technical experts to China:
https://www.washingtonpost.com/politics/2020/04/03/how-much-pressure-did-trump-put-china-access-concerning-coronavirus/ (behind paywall)
January 6, 2020 - CDC issued a Level 1 travel notice for Wuhan, China;
https://afludiary.blogspot.com/2020/01/cdc-issues-level-1-watch-travel-notice.htmlJanuary 8, 2020 - CDC alert to clinicians to ask patients with "severe respiratory illness" whether they had traveled to Wuhan;
https://emergency.cdc.gov/han/han00424.aspJanuary 17, 2020 - The US started screening arriving passengers from China; JFK, SFO, LAX
https://www.businessinsider.com/new-disease-virus-china-us-airports-screening-cdc-2020-1 ; O'Hare and Hartsfield-Jackson
January 22, 2020 -
https://www.washingtonpost.com/nation/2020/01/21/us-screenings-coronavirus-expanded-airports-atlanta-chicago/January 20, 2020 - National Institutes of Health working developing a vaccine for coronavirus;
https://www.cnn.com/2020/01/20/health/coronavirus-nih-vaccine-development/index.htmlJanuary 20, 2020 - CDC activated its emergency operations center;
https://emergency.cdc.gov/recentincidents/index.asp?cid=EPR-homepageJanuary 27, 2020 - US CDC issues highest-level travel health notice, Level 3, recommending that travelers avoid all nonessential travel to China; State Department raises its own travel advisory for all of China to Level 3 of 4, urging U.S. citizens to “reconsider travelâ€, while retaining its Level 4 travel advisory for Hubei Province;
https://www.cdc.gov/media/releases/2020/s0128-travelers-avoid-china.html ,
https://china.usembassy-china.org.cn/travel-alert-level-4-do-not-travel-to-hubei/January 29, 2020 - White House announced the formation of the Coronavirus Task Force;
https://thehill.com/policy/healthcare/480627-white-house-announces-task-force-to-monitor-coronavirusJanuary 31, 2020 - Trump declared a public health emergency;
https://abcnews.go.com/Health/delta-suspends-us-flights-china-amid-coronavirus/story?id=68666037January 31, 2020 - State Department raised the travel advisory for China to Level 4, do not travel;
https://www.usatoday.com/story/travel/2020/01/31/coronavirus-china-flight-ban-delta-cuts-all-flights-white-house/4620989002/January 31, 2020 - People entering the US from China forbidden; Announced January 31, effective February 2;
https://www.cnn.com/2020/02/02/us/coronavirus-us-travel-restrictions/index.htmlEtc., etc., etc., .......
That WHO declared Covid-19 a "Pandemic" on March 11, 2020,
https://pubmed.ncbi.nlm.nih.gov/32191675/ , was just a statistical distinction about the degree of spread. What came to be called Covid-19 was spreading worldwide long before that point in time.
That Moderna began developing their vaccine in mid January was a common sense response to a threat - responding early, rather than late, being the common sense. The same applies, obviously, to BioNTech, who developed the vaccine that Pfizer produces and distributes in the US. The same applies to Oxford University, which also started Phase 1 testing of the vaccine AstraZeneca produces and distributes around the world. In the field of Covid treatment, AbCellera (later partnered with Eli Lilly) and Regeneron began working in their monoclonal antibody treatments, with US government assistance, in late January and early February. AbCellera, in particular, was part of a DARPA project to develop a platform for early development of treatments for potential epidemics.
I don't know why Baylor University was so late in starting development of their vaccine - after Moderna and Pfizer were already doing Phase 1 testing with humans - or why Biological E Limited was so
late in starting human testing, and
only testing in India. I'm just pointing out that the chronology of events answers Texas Tribune's "question".
ETA: Partial credit where partial credit is due, if one reads deep enough into the Texas Tribune article one will find general acknowledgement of the chronology I have posted above, in more detail, that Baylor and the Indian company were much later than Moderna and Pfizer (and eve J&J!), and, indirectly, that they didn't work with the US government. Why Texas Tribune buried the obvious answers to their title "question" so deep in their article, I won't guess.
And now I've given chronology that explains why Moderna and Pfizer had their vaccines in human testing very shortly after WHO declared Covid-19 a Pandemic.
Again I'll say it, there's no Big Bogey-Pharma conspiracy here, just rational responses to rapidly developing events and the realities of time requirements to do development and testing.
If anyone is interested in how things Covid and Covid vaccines progressed, here are some decent starting points:
https://www.gopbriefingroom.com/index.php/topic,412484.0.htmlhttps://www.gopbriefingroom.com/index.php/topic,412485.0.htmlhttps://www.gopbriefingroom.com/index.php/topic,412910.0.htmlhttps://www.gopbriefingroom.com/index.php/topic,412701.0.html