Also not on Twitter and try hard to avoid the easy source-less Internet drama, though I recall some comments about the vaccines being rushed out and not going through the standard trial processes and periods.
It doesn’t seem untrue, though given the environment at the time justified, but that comment was extrapolated to “He’s a hard-right anti vaxxer”. No citations of my own though, so this is just memory.
Either way, this is why I try to stay off Twitter.
You are picking a small comment among a mountain of them and giving the most charitable possible interpretation of it. Strange for you to join conversation to defend the guy as you admit you have no sources to cite.