Brett Gilliam has publicly stated that those techniques he used back in the day are not suitable for divers. The agency he founded does not endorse them and teaches very different techniques from what you describe. (I have the TDI Extended Range manual right next to me at the moment of you would like some specifics.)Brett Gilliam, founder of TDI, is the modern poster child of these controversial techniques. Sure he has exceptional experience and intellectual attributes. But so do many military and commercial divers. Nearly all current techniques in use were controversial before the training agencies figured out how to make money at it, dumb them down, and avoid law suits.
I echo the call for one specific example of this.halemanō;6094690:There have been a number of SB members, or good friends / dive buddies of SB members, who have died recently diving beyond their training, yet often SB Staff has pretty much defended them and SB has not been sued over such "advocacy" of unsafe diving practices.
The closest I can come to this in my memory is Bruce, who went by the user name Cave Bum. He started a very controversial thread that was quite reminiscent of this one. It involved solo diving and his belief that people should be trained for it. The thread was as contentious as this one. It came to a sudden halt when Bruce intentionally separated from his buddy and went his own way while on a cave dive. After his body was recovered, the thread he had started on solo diving pretty much came to a halt out of deference. On the other hand, the incident and his decision to separate were fully analyzed in the appropriate forums.
I feel pretty confident that if I were to die on a dive, the circumstances would be as fully dissected as with anyone else, as well it should be.