What matters are language implementations and CS definitions, not layman understanding on the street.

What a silly objection. You just made up a random argument in your head what that talk was about or what arguments are being made.

It actually does matter a whole lot what developers think. It matters far more than any "CS definition", not that anything here is about computer science.

>What matters are language implementations

No, they do not matter at all. They are totally irrelevant to the topic. In python you can construct your hierarchies to match real world hierarchies. You also can not do that. It is totally irrelevant how the language is implemented.