I think you're trying to say something like "as long as developers are primarily men, marketing to developers means marketing to men". I see logic in that. But what you're leaving out is that the lack of women in tech fields is a serious problem, and it's a problem that is reinforced every time you do something that assumes a developer must be a man. So, whether or not this kind of demo is effective, I think it's destructive and irresponsible, in a small way.

(Besides, I find sex in advertising to be distasteful and kind of insulting. I expect it on TV, but I'd hope that the small community we have here would be a bit less base.)