An excellent example of what? I don't usually like to criticise teachers with more experience than I have, but to me, that is an excellent example of every bad habit that I try to avoid in my shiho-nage. Particularly note how his bum slips out during his turn so that he is left with arms extended and no ability to cut down. I imagine this might be the problem that the OP was having.
How should I say it in polite way
I'm so happy your are able to spot your bad habits! Keep practice!