Weird use of statistics there to support the vaccine.
So in 2020, 23k died.
In the last 4 months, 21k+ died.
Since the vaccine essentially eliminated the risk of death.
Sounds legit.
I am not sure those stats are meant to support just the vaccine, but relate to the benefits of all precautions, i.e. shutdowns and masks. These help explain the current (as of today) difference in numbers between Florida and California. COVID seems to come in waves which last about 2 months or so, Florida's numbers are better than California's because Florida's wave hit in August, and it hit hard. California is likely in the midst of a wave.
Keep in mind that only 60% of Floridians are vaccinated. Not the lowest number in the country, but not the highest either. Further, Californians aren't doing much better on the vaccine front with 61% vaccinated.
Many people were erroneously thinking the vaccines would wipe out COVID. This has proved not to be the case yet and may never. It does seem likely that the vaccines reduce the intensity of the virus in people so fewer are getting seriously ill and dying.
Another thought is that when the number of COVID cases drops, folks become more lax in taking precautions, masking, social distancing and getting vaccinated to avoid getting it. This is human nature at play. It creates opportunity for the next wave.
Clearly nobody has all the answers...probably very few answers at this point. This 'thing' has only been with us a couple of years. Expect that it will continue to plague us for some time and it may never completely be eradicated. Studies based on statistics help us better understand what we are dealing with.