an advanced lifter IMO, is just someone who will not see rapid progression week to week, month to month etc. Their sensitivity to a given training stimulus is low. the numbers doesn't matter much in this context. some will reach an advanced stage with a 440 squat, while others (who're more sensitive to training) will reach this stage at a 660 squat).
Yeah totally understand that definition. Very commonly referred that way in the starting strength community. But for the purpose of our discussion we are talking about advanced level strength athletes, based more specifically on the numbers
