I don't doubt that it's sometimes beneficial for hapas to maintain a vague mystery about their lineage, and I don't  think that it's disingenuous to do so. It could be that Harris might have hid her south asian identity to keep her race out of her campaign, but now that her name is on the ballot and race is one of the top conversations in the world right now, it's unfortunately inescapable for her. It might have also been the case that she's been talking about her ancestry openly, but the media just didn't care about hapas until Harris was alone in the spotlight.