You know what the best K:D we've had at an international event ever? TenZ on Reykjavik 2021 with 1.35 KD followed by Yay on Berlin 2021 1.3 KD, both were when jett was super overpowered with the right click knives and all.
Niesow had 1.46KD, not in one tourney but on average in his career, and he didn't even play jett.
If he's really not cheating he's the best player of all time by a large margin, and that kind of guy retiring before LANs is sus, maybe Ardiis has a grudge but his reasoning makes sense.
Btw I don't think you can have a 1.46 career KD on average in pro play, the best players we know have less than 1.2, I was just giving him the benefit of the doubt.