That one is specifically for Paris as seen by a Parisian. I would not argue that's the case globally, and there are certainly studies showing otherwise in other contexts.
Usage of e-scooter and e-bikes decreases car traffic yes. But does banning rental e-scooter (not personal e-scooters, and not e-bikes) lead to an increase in car traffic? In Paris, I argue that no it won't, or if it does it will be negligible.
> There are other points though, "last mile" is a difficult problem
That's not true in Paris. Paris has very good public transportation. There are bus and subway stations everywhere. It's not the case outside of Paris intra-muros, but here I'm specifically talking about Paris intra-muros, because the ban only apply to that location.
> it's not solved with rental bicycles either (they are usually very few and far between).
That's not true in Paris. The city rental bicycles are omnipresent and cheap. Even though I own a good bike, I use those as well, in cases I don't want to take my own bike. And there are other rental e-bikes (by the same company that do rental e-scooters)
In general, personal e-scooters are considered fine. Their owners don't behave nearly as bad as rental e-scooters.
The speed limit, as far as I know, is the same for any e-bike/e-scooter: 25km/h. Otherwise it's in a different class (same as a moped) and is no longer allowed on bike lanes (which doesn't prevent people from doing so, but so far they are few and far between).