Sure they are; federal, state, and private entities are absolutely running active experiments on the broad safety and efficacy of these vaccines against new variants. That makes them "experimental".
We've got enough data to reasonably assert that they're safe. That doesn't mean they aren't experimental.
Its like saying gravity is a theory. It sure is. That doesn't mean my phone won't break when I drop it.
most of which the companies have not been shielded against, like in this case, and again most of which was not developed in a rushed fashion to address an immediate need.
have you forgotten about the people having heart issues after receiving the shot?
How many times has someone lost their job to not getting the flu vaccine?