If a trans gene were found, by definition it would correlate very well with trans status. If we lived in a better world where transphobes and people pandering to transphobes didn't have as much sway, it would be an additional diagnostic tool instead of a gate to be kept.

I wonder where Tal is seeing these discussions. If it's twitter or tiktok or whatnot, algorithms and social media culture encourage people to take ever more extreme positions just to signal strength of allegiance to their tribe. And since feelings about trans status are strongly linked to political tribalism, you're going to see dumb extremist takes on both sides. That's less to do with left vs. right as political ideologies, and more about realizing that social media and terminally online people should not be seen as indicative of anything larger.