Philosophy by humans must respect the cognitive science of how humans reason.

But it need not and should not limit itself to muddled human thinking. Because we learned math.

This post (and the trend of lukeprog's posts) seem excessively focused on redefining philosophy to be default_human_thought++. Which basically makes a mockery of the whole "concepts already have their own fuzzy meaning and trying to redefine them arbitrarily is bullshit" idea.

You can make philosophy take into account cognitive science and the the average thinking habits of that one particular species as well as allow for other less arbitrary kinds of thought. But luke's posts so far have not done that. I consider them interesting but not quite the philosophy or meta-ethics that they present themselves as.