While there may be implicit biases contributing to theses policies, I think that even without biases you can get public health policies that exclude low-risk people for the sake of simplifying the questionnaire. It’s a question of whether the number of safe people excluded will be outweighed by the number of risky people who would misinterpret a more detailed questionnaire. Updating the homophobic policies was long overdue, but public health is one area where I think that we should optimize solely for reducing disease transmission even if that results in discriminating against some identities (assuming the policies are well supported by the science).