So just to clarify, no mods, means no weapon mods, no third party mods (hoxhud etc), or does it just mean no third party mods? little confused here

You'd have a better chance on the actual game's forums, or maybe sending the mods a message through Twitch or Twitter.

Unsy, it means no third party mods. Vanilla game only. DLCs and everything of course allowed, but no modified weapons, HUDs, lasers, outfits...anything. Stock game.