That radiator is sitting on top of the case.

If it's in a pull configuration, it's pulling air down into the case, fighting against the natural inclination of hot air to rise.

If it's in a push configuration, it's pushing dust into the bottom of the radiator, where it is occluded, and hidden by the fan assembly, meaning that dust will build up there out of sight, and the only way to clean it would be to dismantle the fan assembly entirely.

So he picked a case too small to fit the 360mm radiator he purchased and made this fucking abomination with an exposed radiator sticking out of the top of it. I can't even ascertain how he managed to get the AIO installed in the first place! Did this fucking neanderthal cut holes in the top of his case to get the pump in?

3/10 buy a bigger case where you don't have to literally cut holes in it to make shit fit.

Inform him of the wonder of dual chamber PC cases. And bonus: There'll be more space for his exquisite taste in stickers and action figures.