>his conclusion is there is no reason whatsoever to suspect him of cheating.
No. His conclusion is that based on this really weird brute force statistical analysis there is no statistical indicator that he cheated.
Firstly, how you can state there's no reason whatsoever to suspect him of cheating is absurd. You know he has a previous record of cheating so as a starting point that statement is absurd. But secondly and more importantly, no one is suggesting that Neimann is a moron. We're not saying he's a 1200 ELO lucking out against a grand master. Any account of Neimann cheating is going to include the fact that he's already a very good chess player - he's not going to be cheating through his matches with any average player. And as other GMs have pointed out, cheating could literally involve 1 advantageous decision at a key point in a match.
What we have here is very simple. Neimann was quasi-accused of cheating in 1 match, and this genius has gone off and analysed thousands of other matches and come to the conclusion that there's no statistical evidence of cheating. A methodology that is basically designed to ensure almost no one could ever be proven to be cheating using this method.