Hundreds of millions of doses of Covid vaccines have been administered and, although initially that was under emergency approval, full approval now applies to some. This is so readily established that the first attempt on Google brings a result:

https://www.fda.gov/news-events/press-announcements/fda-approves-first-covid-19-vaccine

Once someone denies a straight forward fact, one promptly loses interest in that persons’s other points of argument.

Karl Mooney, By email