Interesting stuff. I liked the video. I will be interested in reading more about this when English translations are available.
That said, I don’t think the Buddha thought the questions he would not answer were meaningless. I think later Buddhists who definitely had views about the things the Buddha would not comment on found them very inconvenient and tried to work around them. Usually, to justify there theories about rebirth.
I think that saying there is no rebirth would have been as objectionable to the Buddha as saying there is rebirth. The world is is one extreme and the world is not is another. To express definite views about it is to tip over to one of the extremes. He suspended judgement. Later Buddhists clearly did not.
That said, I think it is interesting to see the other side of the coin pushed in the rebirth debate, though I think the view is anachronistic.