Oh no, I totally believe that the minds exhibit dimorphism. The claim I think is extraordinary is that the dimorphism is correlated
with tech thinking, which, for starters, isn't a well-defined term. Is it raw programming ability? (If so, there are lots of reasons to believe that women are
more suited to it than men, which were common folklore in the middle of last century when programming was low-status.) Is it project management? Business sense? Insight into emerging industries? The ability to learn new complex systems? The ability to work with other people effectively?
Once you have that, what's the argument that male brains are better at that particular type of thinking? The fact that more men happen to be employed to do this thinking isn't an argument; at best it's initial evidence that would inspire you to create a hypothesis, but it's not the end of the study by any means.
The interpretation that seems most likely to me, but which is unfortunately horribly politically incorrect, is that men are more likely to be territorial assholes about high-status positions in society, and we'll preserve our exclusivity when we have it. This manifests as us being better at $field for any $field because we don't allow women to have a chance to succeed. (We might allow enough of a chance to succeed so we can avoid accusations of sexism, which would risk our exclusivity, but we don't want to go so far that we concede the exclusivity on our own.) At least this hypothesis has the advantage of the known fact that having an aggressive personality is correlated with gender.