On the day of the insurrection, the vaccines were not yet widely available to most of the public, and hundreds of unvaccinated morons were crowding together indoors, most of them without masks.
It seems very likely that a lot of the Trumper terrorists who have not been tracked and arrested may have died of covid. Maybe the ones that were caught were the only survivors! (That would be cool.)
Interesting theory, but I don't think one can summon up the figures for it to be called a superspreader event-the numbers were pretty weird back then, too. Not quite up to speed.
Probably in a couple of years we'll be able to figure out if it was.