Home court advantage is most correlated with home foul advantage (and non-steal turnover %, which is correlated with fouls). Not eFG%, FT%, RB%, steals, etc. And the advantage has dwindled considerably in the last 20 years. Plus, KenPom took an initial look (link) at the early part of the COVID season and found it to be a good amount less than the previous 5 years (2.25 vs 3.6pts). His theory already was that the refs are biased to the home team, and this was further evidence of that being the main source (0.8 instead of 2.1 foul advantage).A lot of home court advantage is just sleeping in your own bed. But then there's also familiarity with the arena and locker rooms and sight lines which they wouldn't have even if the crowd were 100% screaming UH fans.
It's an advantage for them to some degree, I don't think that can be denied.

