in this thread this particular training is discussed.
as for puking, yet it seems intentional. maybe you need to watch some of the episodes from the fit show. training to you puke seems to be part of milos macho attitude when it comes to training.
the same attitude he displayed when asked on the radio what he thought about failure, where he said they always do it and you have to make up your mind if you want to train hard or some shit like that.
Puking has nothing to do with being macho. More often than not, it's simply a guy, getting dizzy or not getting enough rest between sets. I used to puke when I trained legs. Turns out, I kept holding my breath, while doing reps with heavy weight. So, I deliberately inhaled and exhaled, with a super-deep breath on the inhale and a big blowout on the exhale.
No more dizziness, no more puking!
Plus, it appears the bodybuilders are quite advanced. So, they have plenty of muscle, likely obtain from earlier years of more basic (and likely heavier) training.
In any event, it certainly isn't the first time, bodybuilders have switched to training, using lighter weights and more supersets and giant sets, after they've built their physique, to that point, with heavier weights for years prior.