Not a bug or lag related, when your sliding your hitbox remains at your original position for much longer than you can visually tell. He just hit your extended hitbox.
You can never get banned for using console commands, because console commands effects are either client sided or server based, and official servers (real matches) server commands can not be changed through the console because of sv_cheats being disabled.
Arcane Surge actually is bugged for the door, but in the opposite way. You can pseudo infinitely stack the Arcane Surge buff on door to get increasingly bigger ability range and spirit power bonus, increasing your doors barrier on entry...
It's just an issue with his ult, if Doorman ults somebody while they are inside a door, they will not teleport to the hotel room and instead be active on the main map. When the ult ends, they will take full damage and teleport back to their original position.
Yea theres a bunch of these strange incorrect position ults for Doorman, pretty much for most movement abilities. Very frustrating, hope it gets sorted soon as its a very common problem that can alter fights in major ways.
The stack thing is a bug as even Drifter gains stacks from resurrect, but item effects like Trophy Collector don't gain stacks. His resurrect should definitely not count towards stacks and on kill effects, since it would cause a really big problem with gaining double stacks from killing Victor.
He isn't actually dealing damage to you, this is a spectator bug when you spectate teammates their damage input and output is displayed overwriting your own. This is the amount of damage Aura of Suffering is dealing to Victor himself, not you.