No, not close.

This is not a technical foul.

Will just add my +1 to the crowd...

You have to allow a player to regain their balance and come down safely. Giving technicals on this play doesn't help us at all in that regard.

I had a game where a player dunked and swung like that because of his momentum — he then slipped / let go of the rim and fell to the floor, coming down on his head and knocking himself unconscious. It was a long damn 30 minutes while we covered the player with jackets, kept him still, and waited for the ambulance. Fortunately he was ok.

A hanging-on-the-rim tech is for showboating — that's not what happened here. The official is dead wrong.

In my book, the only way this T is valid is if the player said the magic word or taunted one of the opponents. The action on the rim is legal.

No T from me, for the same reasons that Brad outlined.