I'm pretty the spec sheet claimed 1000 cycles when I bought my iPhone 17.

They do claim it at least for iPhone 15 "under ideal conditions": https://support.apple.com/en-us/101575

VW engine specs said some things about emissions. It’s fine to have unrealistic specs if there are no consequences. The f there’s a law about it they’re far more exposed to people catching a lie or at least an unrealistic estimate.