It's only an "interesting turn" to partisan dipshits who don't pay attention. Trump has been pro-vax and encouraging vaccination for about a year now.
They guy takes credit for warp speed and getting the vax to the public. Why WOULDN'T he promote it? 
Yep, Trump Deranged leftists probably with daddy issues. I'm not anti-vaxx or anti-mask or anti-testing. If someone chooses to do that fine let them do it. If you want a flu shot get one.
In the last few weeks I've known several people who have gotten sick and chosen to get a Covid test. All were negative. There's a flu bug going around, but it's not being reported.