My understanding is just that she had higher testosterone than some arbitrary threshold and everything else has been bullshitting.

Edit: I also want to add to my take by saying that regardless of whether she were intersex or trans the entire "controversy" is bullshit. But this is also an example of how cis women are impacted by transphobia via possibly two cascading levels of "transvestivation". First thebpeiple that originally spread unsourced claims if being XY and now people saying she is trans, all to attack her for being there.