So much this.
So basically it was an "oh crap some are exploiting this" and then somehow normal behavior looks a lot like exploit behavior (I don't understand how this is the case, but I don't play DD or use the market) so people get caught up in the net.
And NOW they are going to look close at it (what?) and then have to go back on the bans...that never should have been placed. Okay.
Sounds like they need a better system for catching true exploits so they don't have to go the "ban first, then investigate" route.
And I agree with the Twitter. That's unprofessional anyway (even if true, why even put it out there...if you know he did that, just leave him banned and move on. Why respond?) and, like you said, if the data really is flawed or otherwise potentially muddied - why be so "certain"?