That is basically MSAA without the edge dection. Rendering in 4K and downscaling is the dirtiest but most effective AA method. But downscaling the whole screen also applies to UI elements, this often times results in tiny blurry fonts if the UI isn’t scaled appropriately. But more and more games have started to add a render resolution scale option that goes beyond 100% without affecting the UI. Downscaling also causes latency issues. I can run Metal Gear Solid 5 at a stable 60 FPS at 4K but the display latency is very noticeable compared to 1440p at 60.
I miss the time when you could just disable the games native AA and force MSAA through Nvidia control panel. But most newer titles dont accept Nvdias override, especialy Unreal games.