I think injury was just an accepted way to train, the Max Aita interview talks about that. Fatigue makes you efficient, and injuries occur when form breaks which again reinforce the need for good form. So you either lift it in good form or don't, if you push that you will get injured. I can see the appeal.
In regards to splitting up the days work, due to frequency and specificity demands they'd certainly have to be done on the same day. But he's saying they would be done with a 30 minute break between them.
Not massively sure how reliable this source is, it certainly runs very counter to what's out there on the *Bulgers*.