Thanks for the link, io856.
I don't have all the facts, which is why I'm asking about it, but at the risk of oversimplification:
The argument appears to be that your fascia serves as a limiter and by stretching your fascia, you'll increase your gains. But stretching of the fascia is done not by thorough, deep stretching, but rather by using heavy weights to maximize the "pump" during your routine.
Heavy weight, in the 8-12 range, with the 7 meaning seven sets performed for the final exercise of a bodypart.