He explicitly said in that particular case it was irrelevant. As for 4 minutes, I call it it total BS. if it were true, MMA fighters would have simply been waiting for the end of round, in reality they lose consciousness in like 10-15 seconds. Hell, old people with crappy vascular system lose consciousness from standing up too quickly, immediately. Floyd needed more oxygen in his lungs, but was not getting it because he was in awkward position
Passing out in 10-15 seconds is the result of a blood choke, not an airway choke! The former is acceptable in combat sports and has no lasting effects unless it's applied too long. The latter is not acceptable because it can do damage to the airway, letting go doesn't always let the person breathe again. (Which is why police departments are banning choke holds--it takes training to ensure you're only doing a blood choke and not an airway choke and they don't train enough to do it safely.)