Regardless of the focus on con-/excentric movements, super long reps of the HIT type will be taxing on both the muscle and the joint.
Bodybuilders like negatives because they work. I don't like negatives because of the side effects which are very real but somewhat overblown by Peaters and underappreciated by bodybuilders.
If you like your routine but want to reduce the amount of damage from excentric reps, then consider the "Doggcrapp" style. It's similar in structure but relies on going to failure instead of working the negative.
Mike never ran his program until after he had gotten huge and his coaching was often by phone. I'm sure he was a cool guy who is similar to me in many ways, I just doubt what I've been told about his training methods.