This is categorically untrue. What you’re mistaking is the difference between the exterior port powering down to prevent corrosion and the tags they use to tell

This is categorically untrue. What you’re mistaking is the difference between the exterior port powering down to prevent corrosion and the tags they use to tell when the device is no longer waterproof (e.g. because the seals have failed or there’s a crack). I know this because we’ve used our iPhone 11s for years in the pool, bath, etc. and never had an issue on a warranty status or battery replacement. They do check that for battery repairs because of the safety issues but you won’t get it for any use which doesn’t result in water inside the case.