Definitely cheating but it sounds like he rebinded his melee to a mouse button which explains why he asked what it is on keyboard. But yeah the snaps and stuff are obvious plus the M&K controller thing
Yes they patched it out early after the game came out on xbox. This game is a port of Halo 2 circa 2007 and therefore doesn't have the sword flying glitch. If you want to use that glitch you'll need a copy of Halo 2 for xbox that is version 1.0
Baked has every right to ban you from the servers he runs. He's not an admin, he is one of the people running the MLG servers and any server owner has the right to ban whoever they want.
Cartographer no longer uses a launcher. To get the up to date game download from https://www.cartographer.online/ and create your account in the in-game menu