The autosplitter is simply a tool to relieve the runner of having to manually split, the final time is determined by hands from the footage and the loads in it.

Probably Xbox Series X because it's the hardware on which you play that matters. A mod will tell you soon enough

French FTW !

Open LiveSplit, go to Edit Layout, then Layout Settings and check Always on Top. You also need to play MW2 on anything but Full Screen mode, so use Windowed. I hope this helps

I'm just checking the comment system, don't mind me (I'll never beat that omg)