Ok, so I've had a chance to think about this some more.
The shows themselves aren't the problem. The time immediately before and after performing halftime or pregame is the social distance problem. As important as we band members liked to consider ourselves, introducing a wad of people in close proximity to the players is not the way to protect them -- you know, the reason for the season. Having the band members bunched up on the sidelines before the show isn't required, but it happens and is largely dependent on stadium geometry.
Heck, even getting down to the field and back up is a social distancing issue just for the members. There are generally only a few points of entry to the field, and a few hundred would need to pass through rather quickly. That causes the crowd in the concourse to bunch up waiting on the band too.
I hate to say, but this might have been the right call. Here's hoping that Dr. Ozello and company picked out some entertaining halftime music to listen to (and that the stadium PA operator will let them play). They'll have more time to perform since there will be 0 transition time.