Doesn't gradually increasing weight, increasing reps or periodically changing exercises cause DOMS anyway?
How is causing DOMS a new theory of training?
Many "scientists" say DOMS is an indicator of
something, but all also say evidently it's not necessary for growth because some heavily muscled people don't get sore unless starting back the first few workouts. Mentzer was one who IIRC said he pretty much never got sore.
Regarding increasing loads, Israetel says if you get stronger each workout you're not training enough! Hard to make sense of that. You're getting 'better' each workout but you should really be getting weaker. I guess there's some "periodization" built in to wash off fatigue or whatever but I always feel my last workouts were successes if I'm getting stronger.
Lyle's long rant on the circle jerk.
https://www.instagram.com/p/DQFSfiyDHSt/