allright ive took a quick look at the video again, hard to see what their first exercise is, but let's say the first set is the hardest and the rest is without rest then it wont come down to strength it will come down to endurance. the more endurance you got the better off you are. otherwise you will not be able to get very far, end up puking etc, not because your muscles say stop - but because your endurance say stop and your conditioning.
so let's say it's 1 set heavy and - 3-4 sets for endurance
why this would be better than 3 set heavy is beyond me.
looks like your cheating yourself off 2 heavy sets (or 4-5 or even 6 sets if you're into volume, like for example lee priest)
someone like ronnie wouldnt do ver well since he wont have the heart and conditioning for this type of training. on the other hand, those who who do would have a hard time training like ronnie because theyre not used to that kinda weight for several sets.