I fail to see how when for all intents and purposes when they are men who adopt the social construct of femininity how their legal status is in any way poorly indicated. Intersex people are still sexually dimorphic. Genitalia is one of a number of ways that someone's sex is determined. Viewing them as the sole way is a mistake, sure there are things like AIS, but even in the case of intersex people, their genitalia and secondary sexual characteristics typically develop in a normal fashion.
Co-option does typically detract from their struggles. By using intersex people as a tool to push a political agenda you detract from the serious issues that surround their legal and medical troubles.
You can't pretend that the actions you take while pursuing a political agenda don't have positive or negative consequences. When equality in the case that you're advocating for comes at the cost of the groups you're purporting to help, or the groups that you use as part of your political narrative, then something is probably wrong.