I mean, this is part of it.
But, I do think to a certain point, in a lot of red areas, the pandemic actually was never that bad. In part due to sheer numbers, and in part due to the fact that yeah, in an urban area, there was never going to be the changes for infection than in say, Chicago. Even when things did become worse in more rural areas, it was still never as bad numerically as in the cities, so to a lot of Trump voters, there was never a reason to change their life, from what they saw.
Obviously, Trump being anti-mask and such turbocharged things and even if somebody like Romney was POTUS, there would've been some pushback, but we also see the opposite in places like the UK & Australia, both Anglo places with strong Murdoch propaganda efforts that are both pro-vax and largely pro-lockdown.