No, we didn't accidentally insert a screenshot of Goldeneye as played on a toaster. That's a player deliberately running the game with extremely bad graphics. Why? To get a millisecond's edge over the competition.
Because e-sports are now a multi-billion-dollar industry, competitive gamers desperately seek any tiny way they can improve their performance. That includes lowering the graphical settings to beyond the lowest the game offers, using text editor tweaks and programs like NVIDIA Inspector to render beautiful multiplayer extravaganzas into violent Minecraft mods.
Once your eyes stop bleeding, the advantages of this particular cheat become clear. Not only does the game run much smoother (which improves your reaction time), but it also features less aesthetic clutter. Imagine slowly advancing on an opponent, thinking that you're safely hidden by lush foliage, only to get no-scoped by someone who turned your bush into three Tetris blocks and a stick. Fortunately, the Battlefield developers have caught on to the exploit and are banning graphics cheaters, which seems a bit besides the point. How do you punish somebody who loves punishing themselves?