Re: Is it proper?
Sounds almost like an Iwama style instructor. Not to generalize, but the two Iwama instructors I've worked with are very concerned with details, and will correct any rank, black belt. I have no experience myself, but the impression I've gotten from my reading is that Saito-sensei was very much the same. Positive reinforcement is sparing; if you're doing it right (or close enough), they don't say anything. Although that's generally true of Japanese pedagogy as a whole.