I watched that video a dozen times and I still don’t understand where the angular momentum came from. That guy must have been trying to throw himself, right??
Yes, he’s throwing himself. Aikido is often practiced solely as a non-competitive art.
If you want to see what competitive throws/takedowns with a kimono/gi look like against live resistance, watch Judo. Example https://youtu.be/fLD87nqwp3Y
For the same but without kimono, watch Greco-Roman. Example https://youtu.be/4Xc-wxNSsTk).
I don't know in this case.
But I do know some of the moves are:
"If you don't throw yourself, your wrist/elbow/shoulder/whatever will be dislocated or broken."
And so the student, knowing this, saves themselves. IE the idea of rolling with the punches.
Which is to say, some moves are to be judged on the possible result, not the one you saw.
Whether that applies in this case, I don't know.