The first time I read the post, I stopped reading when "tit-for-tat" and "superrationality" were misused in two consecutive sentences. Sadly, that part seems to be still inaccurate after Yvain edited it, because TFT is not dominant in the 100-fold repeated PD, if the strategy pool contains strategies that feed on TFT.

To be fair he doesn't seem to make the claim that TFT is dominant in the fixed length iterated PD. (I noticed how outraged I was that Yvain was making such a basic error so I thought I should double check before agreeing emphatically!) Even so I'm not comfortable with just saying TFT is "evolutionarily dominant" in completely unspecified circumstances.