it's a tricky one, i dont think most folk would immediately remember or judge a "cheater" from an airsoft video but i could be wrong.
i've seen vids with folk i know being "called out" although that's more of a "this guy didn't take a gun hit, all the sites i play at those count" when the site the video was shot at was clear gun hits don't count.
i always have a very dim view of the "x" edits, unless the video is clear enough to show the bb striking (which is incredibly rare) or the person then proceeds to call the hit then it's not unreasonable to assume it was a near miss which is what i generally do. yes it's possible they're editing in hits they remember seeing through the scope but ask yourself this: can you remember every hit you've made on a given game day? because i sure can't.
of course even if the bb strikes someone doesn't mean they felt it, plenty of places you can be hit and have no idea, i've been called out before by folk next to me for something like my dump pouch taking a hit which i didn't hear or feel (1j at extended range doesn't hit all that hard), just the nature of the beast and you do need to bear that in mind that no matter how honest the player that can, and will, happen.