There is absolutely nothing “wrong” with the stated claims. In fact, a wide range of users have reported eye fatigue from these screens. Not only that, some of the cheap LG panels can’t properly modulate PWM causing flickering issues and the inability for black pixels to turn off entirely.
Super Retina XDR, that's what Apple has named its new iPhone display with OLED technology. That sounds good but could be a step back for some users despite its great color display and Dolby Vision support.