We know that Ralph Baric at U of North Carolina at Chapel Hill worked on the virus. We also know the US military was in Wuhan for the Military World Games just before the outbreak.
https://prospect.org/coronavirus/did-the-military-world-games-spread-covid-19/
What if China and the rest of the world blames Trump and the US military for releasing a bioweapon in Wuhan???
They blame him for being stupid on a constant basis.
At this point in time, I'm convinced he is actually playing dumb right now.
In order to stay impartial and guarantee he doesn't look like he is pulling strings, I think he is limiting himself to ONLY post about things that are coming out in the MSM.
If it doesn't appear on news networks, he won't talk about it -- hell he won't even act like he knows anything about it. As for the vaccines, the media has made it out to be absolutely safe, and so he will continue to pretend along with them to make sure they can't blame him for anything.
If the media finally starts reporting the vaccines are dangerous and tries to blame him, he can just say:
"I've been out of the loop since Jan 20th. How would I know if the vaccines I cut all the red tape and liabilities for were actually deadly? MSM has been reporting only good things, so by all accounts I was under the impression I did a great job."