It started out with someone reporting you to me, sending me this video:
https://www.youtube.com/watch?v=zWunpfjf0f4. At first I actually thought it was a bug, because as you said, who'd make it that obvious? So I started looking in the logs what the possible cause could be. I found logs of you being hit, but pretty much all of the hits you took from a combat shotgun since the start of my logs, showed damage 0. Then, I started looking if that was a common issue. You were the only player I could find taking 0 damage on a combat shotgun hit. So, I dug a little deeper, and looked into your other hits. Then I found hits you took from UZI and TEC9, only took half the damage than usual (3.3 instead of 6.6). This doesn't just happen because of desync, bad net or compatibility issues... You either take no damage or the normal amount, but consistently taking half damage, that's damage mods.
Then I dug a little more, seeing if you ever took normal amounts of damage, to make absolutely sure it wasn't any bug. And you did. Up until this point, you weren't taking any damage from shotguns, and half of UZI / TEC9: (All of the logs are from 8th October)
[19:14:04] <PBBot1> [3] *** Omega[GgT] left the game. (Timeout) + [Report: X: 0 , Y: 0 , Z: 0 | H: 0 , A: 0 ]
Then, you returned, and took normal amounts of damage (6.6 from UZI and TEC9, and one of the only times you took damage from a combat shotgun).
[19:14:26] <PBBot3> [0] *** Omega[GgT] joined the game
The normal amounts of damage lasted, up until the point you got killed by a Combat Shotgun (Only the first time you got killed with a Combat Shotgun in the last month, out of a total of 117 deaths).
[19:42:25] <PBBot1> *** Unicorn killed Omega[GgT] (Distance: 22) (Combat Shotgun)
After this point, the damage switched back to no damage from Combat Shotguns, and half damage from TEC9/UZI, without you leaving the game or disconnecting.
Now all of this is pretty clear and concluding evidence you used mods/cheats to modify the damage you took in the game, and toggling it on and off while you were playing. You will not be unbanned.