Playing on PS4, and since the beginning of this season (which ironically coincides somewhere thereabouts with a CRONUS ZEN mod update for Siege)...I believe with utmost certainty that people are wallhacking...or perhaps that "auto-ping" mod is helping them in some form or fashion (though I don't know much about it...other than that scum use it).
And before you argue semantics with a professional Software Engineer with 23 years experience about what constitutes a "hack"...well...just don't.
I'm seeing lots of cases where there will be 1 or 2 players who just "know" where people are..at all times...be it attack or defense. Yes, I know there are cams, teammates, etc. that can help...but these people are doing so consistently throughout the entire match, ending up going 15-1, etc.
There are places where you could come from multiple angles, but they are perfectly holding angles where you will be coming from, no moving, no checking flanks...nothing. For instance, a teammate could be calling out that we're outside a doorway to the west...but you could be coming from left or right...and they know perfectly which side and are ready to fire. Once or twice...could be solid play and good callouts/cams...but the whole game...going 15-1? Naw...the mods have gone beyond recoil control and lean spam...this is whole other level.


