Yes, and it's easy to verify how much of the original capacity remains (95% typically).
The deprecation has very little to do with the cars themselves. It's mainly due to original prices being inflated during covid demand spike + chip shortage followed by releases of decent brand new EVs under £25K.
A 250,000 mile Tesla battery is less likely to need replacement (3% odds p.a.) than a 250,000 mile Toyota engine (4% odds p.a.). And a Tesla battery is slightly below average reliability compared to other brands and of course a Toyota motor is more reliable than any other brand.
Used cars still take a full fuel tank.