My point about collective is that according to the original proposition, max lift is at the "ultimate coning angle" and this value is self-limiting. Therefore the pilot is free to request as much collective as they wish, the lift will max out at this limit. The only thing then determining the available thrust at this point is the rotor speed.
I question your source of "fact" about the speed of the Apache in the clip. So far you've only referenced your opinion. If we ever see it, the data recorder should clarify. My opinion is (with substantial error bars) is about 45 knots. Please quote your source of the data so we can peer review. As you say, facts are facts.