Hmm. Seems to be conflating momentary muscular failure with not hitting PR’s on lifts which are two completely different things.
““When you fail, you bring doubt to your head, you start to believe that you can’t lift that weight. If you never fail in a training sessions, you build so much confidence,” he said.”
I mean, if the objective of your set is to reach the point of momentary muscular failure and you reach that point, then you’ve actually succeeded.
And anyway, in all honesty, a total genetic outlier like Thor is really not the best person to be listening to on what works and what doesn’t.
Was thinking this as well, I just didn’t want to be the person to poo-pooh his training methods 
I was watching a video a couple of weeks back about his pal Larry Wheels’ latest mishap and funnily enough it was on my mind before I opened the thread.
Nick Trigili more or less makes the same point about normies trying to follow the lead of outliers and how stupid it is (albeit in this case it was about some kid being nearly crushed to death after trying to make a huge jump in the weight he’s lifting, because that’s what Larry does).
I took what Thor said as coming from a strength athlete perspective. And from that perspective, he’s absolutely right – if you are a powerlifter for example, you shouldn’t be missing lifts on the squat, bench or deadlift in the gym with any regularity. Not if you want to successful that is.
“I wanna set a PR!” Trains with specificity and consistent conditions for months…
Goes on youtube. Changes everything.
Drops 405 on himself.
I dunno what happened?