The masks (the real masks, when worn correctly), combined with the other stuff like staying away from people as much as possible, washing hands, etc. absolutely helps. Obviously it isn't fool proof though and I'm not #TeamMask. I hate wearing one, but if this virus had a death rate closer to 25% than 1%, I suspect we'd see more folks buy into the "masks help" argument. As for Saban specifically, there's probably a reason he didn't catch the virus over the summer when half the team had it at some point or another. Also probably a good reason Saban is the only staff member that tested positive today, as he's in and out of meetings with them all day, all week.
I will say, I'm curious how he and Byrne both tested positive on the same day with no others (if everyone was tested at the same time). I'm not a fan of testing people who don't have symptoms, but I get it, especially in that environment. But all in all, it's just not a huge deal. The game will hopefully go on in a few days, and this could be a big opportunity for Sark. Also thankful that Saban got the asymptomatic version at his age.