Well, for starters, their whole argument is that "spike protein is bad". Which clearly is true - that's how COVID-19 gets in and does its damage.

But it has no relevance to whether or not mRNA vaccines are bad, because they don't encode active spike protein. They encode bits of the spike protein equivalent to chopped up inactive spike protein.

It's a bit like saying "measles can kill, watch out!" to someone taking a vaccine with inactivated, chopped up measles, the whole point of which is not to infect but to create an immune response to the "bits" that will cross over to the native virus and stop it.