I was thinking more in line with a well trained individual, not regular Joe shmoe. Mainly in terms of the required training stimuli for a well trained individual being different than a novice trainee. I think there was a Finnish study which lasted 2 years IIRC that looked at how changing out the training periodically resulted in significant increases in gains each time the training was switched up (more or less proper periodization rather than typical progressive overload). I wasn't suggesting that the training protocol is a miracle cure all for all individuals but it would appear likely that for a well trained individual that is highly adapted to training, drastically increasing the intensity should counter their adaptation to damage from exercise.
Not suggesting that PA requires drastic training to produce results, we already know from the earlier Hoffman (?) study that this isn't required. Also keeping in mind that the Joy study which is linked to in the first post of this thread, wasn't the extreme HMB training protocol, but it was a daily undulating periodization scheme. The Hoffman study essentially used a typical progressive overload scheme.