His kind has recent common ancestors with LessWrong Man, who himself evolved from Archaic Overcoming Bias Man not so long ago. This is why I think it probably is acceptable to include him.

Because of the site fork, there are lots and lots of comments written by him on LessWrong on the sequences, some of them quite influential, that and we do cite OB as a sister site.

Edit: Thinking about it some more I've decided to add several hominids who mostly hang out on OB too.