No, that is not normal. The stall warning that is.
Is it normal for a 210 pilot early in their career to screw up? Yes.
Hopefully lesson learnt for this bloke.
Endless stories of 210/ 206 near misses. I can recall a very similar story in a 210 from 15 years ago. Old mate who is still a good friend afterwards put his hands up hands up "I screwed up, I survived, I wont be doing that again." And he had the Flaps up! Whoops.
Endless stories of twin near misses.
Luckily my colleagues and I were smart enough to learn and avoid disaster. Some were not.