Didnt find anything from his blog to be too offensive. However, it sounds like his years of frustration with women quitting could contribute to current/future female students not staying. He says he wants women to stick around, which im sure he does, but when a women comes in and he has the mindset that she's not gonna last, he might unknowingly not put in the same focus or positive energy that he would with a male student.
I think the biggest problem when promoting BJJ to women, or men as well, is that most people really dont know what training in BJJ is like. I think there are a ton of women out there who would absolutely love BJJ and make it their life, but they'll never try it because they have a false impression of what it actually is. When i talk about BJJ/MMA to people with no experience in it, they assume the class is full of ego driven Ultimate Fighter "Let me bang bro!" type meatheads. With that impression, it's not surprising why so many women wouldnt even want to give it a shot. In that respect, he's right about women needing to promote BJJ to other women, giving them a realistic view of what an average class is like and all the positive things they can gain from it, aside from just being able to defend yourself.