This is a legitimate question, so I don't know why it's being downvoted. Especially given the statement in the abstract of the paper that says, "We show here that S protein alone can damage vascular endothelial cells (ECs) in vitro and in vivo...."

That being said, other people on this thread have provided reasonable mechanistic explanations as to why the vaccines would not have this effect, but I will also add we have _empirical_ evidence that the vaccine does not impair endothelial function (or at least it is extremely rare) because we have millions of people who have received the vaccine without impaired endothelial function.