I haven't read Blank Slate. What little I remember of the fraction I read of How the Mind Works made the case for a materialistic and reductionist account of the Mind, and pointed out that the Human Mind evolved by natural selection. I am in complete agreement on both points - those viewpoints did not originate with Evolutionary Psychology, and EP does not have the sole responsibility for defending them.

So, since I don't know the explanations you are talking about, I can't say for sure they are pseudo-science. But I do know of a demarcation criterion. Did Pinker suggest how his explanations could be tested by experiment? Did he report the results of experiments? If not, then he was either doing pseudo-science or philosophy. Sorry, I don't have a demarcation criterion to distinguish those two. But, if someone says they are doing philosophy, I usually give them the benefit of the doubt.