Louie Simmons was quoting one of the Russian's (Zarkovski I think) who wrote a large summary of russian training methods. Zarkivski mentioned dynamic, maximal and repetition training and mentioned in his writings that repetition training had to be done to the point of fatigue or maybe failure to stress the most motor units.
Simmons really misinterpreted a lot of what he read about the russian training especially GPP and conjugate periodization though. According to Zarkovski, GPP was not "conditioning". It was actually what Simmons calls SPP, like using a limited range of motion/partial reps. The reason that partial reps were considered to be GPP and not SPP by Zark, is that partials were less technically demanding and so they allowed more general, less movement specific strength development. (If you build stronger triceps with a lockout you can generalize that strength to other tricep based movements).
Simmons used different percetages. The Russians based everything off of a 90% max as being a 100% training max, and they most frequently used 4-7 reps per set on squats. The true weights that they used were typically between 60-80% of their competition max.
Simmons recommends against getting emotionally psyched up for a lift because the cortisol and adrenaline are catabolic.