The part he didn't mention is interpolation at the low end "specs are mere suggestions" end of things. I have a backup Android phone - a true "brand X" type of thing, vanilla android, bought at a garage sale. Nice enough phone, but claims a 40MP camera. The merest glance at a picture taken by it shows it has an ordinary-for-its-time 13MP camera in it and the pictures are interpolated to 40MP.

Hopefully the camera doesn't upscale and then downscale again if told so save at its actual native-ish resolution.