“Actually the battery will probably lose the exact amount every year, and nothing will ever go wrong with any parts of it, and also they’ll also break the rest of the car at the same rate as a gas car, which is 20 years, which we’re going to call 15 years. Which means in 12 years the car will be useless, but the battery will still be at 80%. MATHS.”
When your car just works, you don't report anything. The Prius is relevant because it has a battery pack (NiMH chemistry) famous for doing 300000kms before replacement. Not sure what extra words are going to help, it's a simple concept, don't need to report what ain't broke.
I'm not sure the Prius is actually relevant to this conversation in anyway. That 300,000 doesn't account for time, and batteries also aren't made of the same materials. You also have Cabs upping that average, which most people are not cab drivers. And that is a significant factor, as I'm pretty sure the Prius is one of, if not the most popular vehicles for Cabbies.
an average EV battery degrades at 1.8% per year, it will still have over 80% state of health after 12 years, generally beyond the usual life of a fleet vehicle.
You still have to assume they're using average fleet vehicles use as their comparison, but at the same time also that they're using 80% battery as comparable.