Shadow of the Tomb Raider OLED 120 FPS 4K Trick compare with Native 4K

Custom resolution to trick LG OLED 2019 Models to play games 4k 120.Actual internal resolution on TV will be what is in the screenscot below but I can not tell the difference.So you want to play and old game higher than 4K 60 fps,you can try it out for fun.
https://postimg.cc/9Rrg9YHB