Many thanks for your detailed reply and really no need to apologise – some user interpretation is to be expected in hundreds of pages of expert guidance! That helps a lot, thanks again.
As a follow up: I assume the 4-6 sets per weeks slowly increases? So, for example in an 8 week period, 2 weeks at 4 sets, 2 weeks at 5 sets aand then 4 week at 6 sets?