Is it true that the 2020-21 season was the one that ended up being the "COVID year" for eligibility purposes? I guess I always thought it was 2019-20, since there was no tournament, but another comment (and what I could find online) made me think maybe it was actually the following year.
There may be some weirdness around other non-revenue sports with different seasons, but yeah, for basketball, 2019-20 "counted", and indeed many lesser D1 teams finished their seasons completely and all of them finished the regular season, but there was just no postseason played.
Then, in order to (1) avoid controversy and (2) induce players to be willing to play a season which as it began was a big unknown in terms of how many games would actually happen, before the next season they announced that essentially the eligibility clock would not run in 2020-21, as was the case for the 2020 football season.
So there are no waivers needed for guys like Domask or Guerrier this year, this is just their fourth year of normal eligibility even though it's their fifth season of college basketball. The clock didn't run for one of the seasons.
You get a waiver if an injury cost you a year of eligibility. But an injury
didn't cost Domask a year of eligibility, there was no eligibility to lose in 2020-21, same as if he'd opted out for Covid reasons.
It was the same with Tommy DeVito, having suffered a season ending injury in the 2020 "free" Covid year at Syracuse, and he did try for a waiver and it was denied.