I'd never heard of the term "supra warm-up" before, but that used to be a fairly common practice for combining strength and mass. Hepburn popularized it back in the 50's and 60's (an old time Canadian strongman and Weightlifting champ, more geared to PL but it didn't exist back then). I also saw a lot of it in some older issues of PLUSA. The idea was to do singles up to a heavy, yet still doable weight, then drop down and do 3-4 sets of a heavy 5-6 reps. Worked pretty well. A variation on that was to go to a heavy yet doable single, drop down, get 57 reps, then do another single, heavier than the first, then drop back down and get 5-6 again, but heavier than the first time. Poliquin calls it the 1-6 wave. Some some off the wall tidbits.
You know I find the more I listen to people that have been in and around this game, and those that are schooled in the history of it, everything a lot of contemporary guru's "invent" has been done before, and they just re-name it.
Not to take away from anyone who is a author or comes up with a great program, but it seems like everything that works, was done before. Back before they had a scientific study for it. Back when they just experimented, found stuff that worked, and did it. Back when it was basically "eat big & lift big."
I feel like a lot of the information now, over complicates something that works in a very simple form.
Just my .02, I could be wrong