As far as I can tell Aseem's claims about the mRNA vaccines are not taken seriously by those in the know. His 2 papers - published in an obscure journal of which he is one of the editors - have been soundly demolished by a couple of experts I trust. Even Tassim Nicholas Taleb calls his view on vaccines "BS".

One of the problems with social media is that even utter nonsense will have lots of supporters.

I have had 4 vaccinations against Covid - and - over the years, possibly 15 or so against 'flu. A slightly sore arm a couple of times - no other side effects.