@Helkath-Hazzurim "Undermining myself", isn't a problem here. However, it is funny that you expect a lot of movement from a console player.
All that aim assist does is help them track you better. It doesn't let them snap to you. You could have ran around them, and it would be harder for them to hit you, assuming they have a low sensitivity. Even if it's a high sensitivity, you would of noticed them still missing shots.
Aim assist is like that baseball holder stand that you would use for people just starting out or for little kids, so they can hit the ball that isn't moving. Yet, people seem to think it's aimbot. If they a had strikepack or like xim, or something else, you would of been flatten the moment they shot at you. There wouldn't be a any kind of misses.
You say you're using aim smoothing, if you were really that good, you wouldn't of be missing shots since you would be "on point". Not to mention that method seems like it should be considered cheating, due to how it is negating recoil. Just saying, the guy in the video wasn't missing with their shots, since they basically don't have recoil.
Oh, and as mentioned before... Flatline does kill faster, you were too busy missing shots yourself, so you didn't get the better of them. You've also stated that you're not calling them a cheater exactly, well if that's the case... don't report them. That falls under "falsely reporting", which could get YOU banned instead.
You have to be sure they're breaking the game's rules or have a real reason to report, that isn't out of spite due to their platform, like what
@E9ine_AC had stated before.