As with anything else, the truth is almost certainly way more complicated, and reasonable minds may differ as to what risks are worth taking.
But we need only compare our two largest states to know that this study is likely a load of crap:
| Total Deaths/100k | Total Deaths/100k pre vax | Total Deaths/100k post vax | % pop. >65 | Vax Rate (doses/M) |
CA | 224 | 147 | 77 | 14.9% | 1.86 |
TX | 297 | 168 | 129 | 12.9% | 1.57 |
FL | 342 | 159 | 183 | 21.1% | 1.72 |
*I picked April 1, 2021 as the cutoff date for pre vs. post vax, as that's approximately when most people >65 could get vaccinated. The numbers won't be much different if I push it out another month or two, because the death rate was pretty low by then and stayed low until August.
***EDIT: I added Florida for fun, since Desantis is featured prominently in the article.