Are the hospitalizations actually from covid? Or did they show up to the hospital for a separate reason and happened to have positive covid test as well?
you'd need to come up with a good reason why unvaccinated people were about 10x (or more) likely to be hospitalized than vaccinated people
In any case, when more than half your population is vaccinated, especially the older aged folks, at that point it doesn't make a remarkable difference what it's from as the correlation is still clear.