In all honesty, after watching 2 demos, I'd say it most definitely not obvious (or not obvious to me anyways). I'm not going to question the legitimacy of this ban (as I have no rights), but personally, I'd have to be between borderline inconclusive to pretty decent wh hiding (25k in shotty probably would be it for me). Spacetower was not too bad and the most obvious one you didn't listen (IMO) whereas for shotty, I'd say 12800 and the next round (16000) were close to worst ones as the pre-fire was extremely obvious (compare it to 22k and 25k where the pre-fire was very different and where he knew the other behind the box with no radar or other means to know someone was there.) , although understandable due to the map (while also pointing that he acted different in 18000 vs 6600).
Also, IMO, it's a bad idea to call out a hacker out in public unless if you ban hammer him at that specific time. (the remaining few ticks were rather interesting to watch, tho)