The actions in the train scene didn't seem so bizarre to me, and even if they did we can still write bizarre events and characters? Similarly the spiderweb skin, where's the line between 'no human would ...' and writing a strange character?
I don't have anything like the OOP's experience with literature or even AI, but I'm not really convinced. It is nevertheless interesting that they believe they've identified it, and to think of the ramifications, aside from whether it's a correct analysis or not.