According to the most recent data from the CDC (https://gis.cdc.gov/grasp/COVIDNet/COVID19_3.html), 960 out of every 160,000 Americans has been hospitalized due to covid (this is across all people regardless of vaccination status).
So there is _at least_ a 99% reduction in the rate of hospitalizations for the fully vaccinated, according to the figures he cited.
The message he's sending is that even if you are vaccinated, _you're not safe_. Why is this an effective message for persuading those who might still be convinced?
Is the overall outcome better than if our political leadership continued to transparently emphasize vaccine safety and outcomes, rather than scoring points with their political base? You convince more people to become vaccinated by being convincing. When you get more people vaccinated, you save more lives.
If someone's position is, that it doesn't matter if the overall outcome is worse, because the bad outcomes are more concentrated in selfish/stupid/red-state people, then I simply disagree with that.