I don't want to comment on what Endo Sensei is doing, but what he is describing in the subtitles is not internals.
When he teaches
this during class he does not refer to internals. And he does not use words or terms that can be found when talking about internal practice.
Nevertheless: Feeling this, watching him when he just does
it with his uke (not teaching but practicing himself) and teaching and practicing this at home myself made me listen up, when I read about internal training here.
... I think there is some relation ...
but I don't think, videos of Endo sensei will help to get into internal practice.
It's the other way round: When you get an idea of internal practice you will find things when practicing with Endo sensei or with some of his students.