Now, having said not a bad point..
Natural Selection:
noun BIOLOGY
the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.
Natural Selection is Survival of the Fittest to survive a given scenario. When we vaccinate - we are circumventing natural selection. Instead of the fittest surviving - we make the less fit, more fit to survive. By definition of Natural Selection (organisms better adapted to their environment) - vaccinations push this process to the side.
One could argue that "adapting" is getting a vaccine. One could also argue that "adapting" is getting sick with COVID and surviving it.
So we are both technically correct !