Not to sound like a smartass, but honestly I don’t know, and I don’t care. Just because Blackhawk's lawyers are okay with it doesn’t mean you should be.
Look, my first kydex/polymer holster was a Serpa. They are widely available, so I bought one after only buying leather for carry till then.
First time I shot with it on the clock in a match seven or eight years ago I was yanking on the thing in the “stress” of the moment right after the shot clock went off. Didn’t like it. In that time I’ve been through multiple classes with recognized trainers both locally and nationally and heard the same thing regarding that holster. Won’t allow it in their classes.
Additionally, I shoot defensive pistol matches nearly every weekend somewhere in the state of NC with around 5-6 different match directors, some who I have gotten to know personally and they have been doing this for upwards of twenty years each. I’m also a safety officer at the largest of those matches where we run 75-100 shooters a month. None of these match directors like those holsters, and you won’t see a competitive shooter run one.
Now, lets say you are LEO, and have to go hands-on with folks from time to time. You obviously need some kind of more positive retention. As I mentioned up thread, there are superior alternatives. Safariland making two fine examples. I own neither because that’s not how I carry, nor am I LEO.
My only two cents further on the matter, if you decide to try your hand at shooting on the clock, don’t bring one of those holsters.