I would love for Garza to come back more than anyone, but I'm fairly confident that he's gone. If we knew their was going to be a college basketball season, he'd very likely be coming back, but at this point, I think there's almost zero chance of a season. It makes much more sense for him to get into the draft. Even if he's a late second round pick or a UDFA, it will allow him to get on some NBA team's radars and get into camp somewhere.
The NBA will almost assuredly have some kind of season next year with how effective their bubble has been so far. You'll likely see way more roster spots and maybe even some "replacement player squads" or "practice squads" so there'll be even more chances for him to get himself in front of NBA GMs and scouts.