From the article linked above:
WASHINGTON — Former California Republican congressman Dana Rohrabacher confirmed in a new interview that during a three-hour meeting at the Ecuadorian Embassy in August 2017, he told Julian Assange he would get President Trump to give him a pardon if he turned over information proving the Russians had not been the source of internal Democratic National Committee emails published by WikiLeaks.
So
The Daily Beast lied, or at least was fed false information:
1. Trump offered Assange nothing;
2. The offer made to Assange was Rohrabacher's offer and initiative, not Trump's;
3. The offer asked for evidence - proof Assange did not get the emails from Russians - not a cover-up.
Gotcha-Trump # 567,890 collapses, unsurprisingly.