Google says bumpy Pixel 8 screens are nothing to worry about — Display ‘bumps’ are components pushing into the OLED panel

Bumps the size of those shown are pretty obviously a defect, because it distorts the image in a way that can not be reasonably expected for such a product, even if it's only visible for a very keen eye, it can be returned by the customer under warranty.
If Google should try to refute that, they will almost for sure lose any claims decision under EU or comparable law.