I call total bullshit on this. I drive a (work-provided) Prius every day. This thing has some serious get-up-and-go...meaning as I drive it every day I simply smoke those (front) tires. I leave most "performance cars" (ICE) behind at the light. That means that I am tossing micro-plastics out at a greater rate than most cars. I burn though tires every 15,000 miles.
When I get a red light (remember, I don't own it, it's a work car) I slam brakes until I can punch it again once it's clear. The regen-brake thing never applies given how I drive. The Prius is not inherently greener, it's just more fun than the ICE alternative I had before.
I do burn through a lot less gas so I guess 30-50 MPG is worth something.
It’s about comparable vehicles and driving techniques. If you tried to drive a similar sized ICE like you drive the Prius then emissions of all sorts would be greater. It might be hard to as the acceleration of an EV is hard to match.