I liked the video, and when you listen to it it all makes sense what you mean, but my two cents, the first slide, on it’s own, may rise a few eyebrows and for some lead to dismiss it, I’d just be carefull with those generalities especially on the opening of the video. Star grounding, maybe not for the electrician but for the electronic designer, means a different thing that joining all your mains earth pin in a single outlet, proper star grounding in equipment solves hums, but I realise that you are talking to non engineers about hooking up their equipment, but it was not necessarily obvious from the very top. Dedicated ground for audio also have benefits, but yes as you rightfully said doesn’t mean disconnecting it from the neutral and planting an isolated pole from everything, As you showed, there is voltage differentials on ground outlets. Having a ground that is not the same as your inductive electrical motors help with that, but obviously not a must for typical household. Again, nothing to argue about what you say, just the first page, without context present “myths” that are debatable.
