There's a video of Hikaru Nakamura looking at some of the games identified by this report, and he was admitting that it wasn't immediately obvious to him: the games looked like good games (although I didn't watch the whole video).

So such a test of the system almost feels necessary for the chess world to see if they really can tell the difference between high level classical OTB play and cheating. It would be interesting indeed if ever the consensus was that a fair player was the cheater and the actual cheater just looked like "good play"!