I don't think that they're saying that vaccines don't protect people. Rather, that, because of how the immune system functions, it matters which strain of Covid the vaccines were designed to protect against. It's less an anti-vax argument as an argument that the roll out of the vaccine should have been undertaken with the expectation that the virus would mutate.

I have no idea if that is actually correct, but I don't think that IAMOBSCENE is being antivax