There are a lot of speculations and hypothesis from people who don't live in Paris and try to apply their experience in a different city to Paris, so allow me to offer the experience (obviously I'm biased) of someone living there.
The first big misconception is that this ban is only due to elderly going to vote. While the 90% percentage is indeed skewed, recent polls from before the vote showed that about 60% of the population approve of this ban. It's not as overwhelming, but still a majority.
People are fed up with rental e-scooters, but why? Not because they are littered everywhere. It's not longer the case. There are dedicated e-scooters parking spots, that are overall used properly (though they are often on the floor due to wind or being knocked down). The article talks about "tightening regulations", I'm pretty sure there are rules enforcing that.
The real reason is that anytime you see someone egregiously disregarding rules in a way that endanger others, it's more often than not a rental e-scooter, with rental e-bikes coming behind. They are perceived as dangerous, plain and simple. And it's not a lack of cycling infrastructure. While it's not up to Netherlands-level of bike-friendliness yet, it's quite good lately overall.
Now a last misconception is that this ban is bad because people will revert to cars. No they won't. In the first place, people riding rental e-scooters do not replace a car trip by a rental e-scooter trip, they don't even own one for the most part (or even have a driving license). What is replaced is a subway, bus, bike, or walking trip. Perhaps on some rare occasions a taxi/Uber. Apart from that last rare occasion, all other alternatives are MORE eco-friendly than the e-scooters.