This is the kind of objection I’m excited to see, and actually made me update down (tentatively, a bit) on the OP. Releasing that recording, or allowing trusted third parties to listen to it and attest to its contents would make me update more, and the more specific claims where you can say “no, indeed, Kyle is exaggerating” the more seriously I’ll take your objection in general.
(I have my own perspective already regardless of the OP.)
Well, I’m sorta mostly sympathetic, but I think “what is [in] fact harm” is doing most of the work here. So you’ll find basically every traditionally trained living teacher being like “oh sure, the teachers I revere absolutely treat their students like shit, scream at them, demean them, etc. This is functional! I endorse this!”—and I’m like, ok well, in decent part this stops being an objection about soryu himself.