According to the date stamps on the Reditt account, his posts predate the shootings by at least 7 months, and stop a month or so before the shooting. There is at least one post of him in a video, where he brags it's him. He's said many times what his real name is. Others have claimed to know him and he is who he's claimed to be. And he's posted pictures that are both in the area of Parkland, and also in California where he was on a family vacation.
I am not going my "NaturalNews" for this, I went and looked at the account for a while. He is the person associated with that account. That said, I've read some of it, and it just confirms what kind of person I thought he was.
This not fake news, but just irrelevant news.