Yes very sad. RIP
No idea exactly what you posted here but it is true that Toby Keith was vaccinated. Here he is performing at a 2021 New York concert where he would have had to be masked absent proof of vax.
https://bigfrog104.com/covid-19-guideline-for-toby-keith-concert-at-the-adirondack-bank-center/
A similar concert promotion in Nebraska would seem to assert the same.
In any case, no article from the period calls him out for refusing the shot. Which fact itself supports the assertion that he was indeed vaccinated.