Of course not, apart from SD, you'd be hard pressed to break the remaining rules in any kind of training (and I'd mention that some naturals grew the muscle using HIT approach of training each body part once per week or even less frequently).
What I meant was that Totentanz extended 5's for as long as he kept getting stronger, and Jester seems to prefer even lower repetition loads, both defeating the purpose of HST (as a reminder, Bryan believes that working with the same loads for too long and increasing poundages as strength levels permit is suboptimal).
As long as you approach whatever loads did grow new muscle during the previous cycle, and surpass them having gotten bigger/stronger, yes, new muscle hypertrophy will start. Less SD doesn't necessarily mean that 75% of 10RM or even 10RM itself with the same volume as before starts piling up newer muscle on you. The higher you got load-wise during the previous cycle, the higher you'd have to reach for the loads to be effective again using the same volume. RBE sucks.