And testing confirmation bias in this fashion is intrinsically deceptive, so I probably have damaged my online reputation as well.

I have no way to back this up and just posting this tastes like hindsight bias to me. Nonetheless, this was my train-of-thought when I read this post :

1. Gwern is using what looks like normal communication as a means to experiment.
2. Gwern is a data-crunching, prediction-making, experiment-performing, freak-of-nature. (I mean this in an extremely complimentary fashion.) Therefore:
3. This wasn't the first time Gwern did something like this and it will not be the last time.

Of course, as Rational!Beyonce would say "If I thought it then I should have put a prediction on it."