I hate that he decided to call it "male brain". Males are not more autistic than females to begin with; and autistic traits are not usually male traits. The only aspect of autism that could be called "male" is the tendency to have highly localized brain functions and to think in concrete and detailed terms; and that is not so different from male to female as it is from NT of any gender to autistic of any gender.
There is more to being "male", and more to the "male brain", than that systematizing tendency. To call it so globally an "extreme male brain" is highly misleading. It feeds into lots of fallacies--the idea that autistic people must be good at math; the idea that autistic people are incapable of empathy. It tangles up stereotypes about men--which are already annoying enough for men to deal with--with the stereotypes about autism, and makes both worse. It may mislead professionals, especially those with little specific autism training, into the belief that girls with autism are "masculinized" and that boys with autism are "more male" than their NT peers. Autism is not related to gender nearly that much; in fact, it seems from what I've seen on WP that autistic people are not as likely to follow traditional gender roles as NTs are.
And on top of that--autistic males and autistic females work somewhat differently, too, just like NT males and NT females are a little different. Add to that the hormonal and social differences, and you have gender-related autism issues that should be addressed without obfuscating them with "male brain" assumptions.
The idea that autistic brains work differently, that we are more likely to be detail-oriented, focused on concrete ideas, and skilled in narrow areas, makes sense, and is an idea worth investigation to see whether it reflects reality. But calling it "extreme male brain" makes no sense at all, whether the autistic in question is male or female.