[lacer]

NEW EVIDENCE:
In this video the main focus is the beginning. Watch as he deagles some dude in the head and it looks like the shot isnt even remotely close but it lands anyway.  Second is that he gets shot  at immediately after killing that dude and knows exactly where he is getting shot from.  

https://streamable.com/h1x8b

Without watching the video, I can tell you this:

Like rue said, spec interpolation is fucking awful in source games like gmod, which could possibly be why it looks like the first shot isn't close but lands anyway.

The second one is about knowing where he's getting shot from. If you have good gamesense, it's not hard to know where you're getting shot from. Will watch videos after I post this.

edit: After watching for the two parts you mentioned, I see nothing sus about it. The first kill was a decent flick, and you could literally see the guy shooting him. Doesn't seem like evidence to me.