You keep on asserting this, but a quick straw poll of online articles suggest EVs depreciate at least as much as ICE cars.
I think
@Archie_tect bought a nearly new hybrid which had depreciated by about a third - the same as you would expect with any nearly new car.
Nothing to suggest the EV will somehow magically hold its value thereafter any better than an ICE one.
Further, Archie's car was in short supply, so goodness know what will happen if there is a glut.
Published depreciation figures don't tend to take into account older vehicles because none of the fleet operators are interested in them.
However, many of us will end up selling, if not buying, an older vehicle.
A tidy diesel engined car with 100,000 miles is still seen as having some life in it.
A tidy electric car with the same mileage will, rightly or wrongly, be seen as in need of a new battery pack, particularly if it is eight or 10 years old.
The pack will be thousands, effectively rendering the car worthless, particularly when a buyer can get a similar age and mileage diesel for £3k-£4k.
The motor trade takes no prisoners, so a tired old EV will be marked down just as savagely as an ICE car, or rather more so because of the thousands it will need spending on it.