That's probably on explanation.
Not to beat a dead horse (although I love doing that) the fact that there are no biological women in that image tells the entire story. Maybe it was the trannies being creeps trying to get lesbian girlfriends, or maybe they got weirdly hostile to anyone who was born with a vagina, but the fact is that there used to be a lot women at these things and now there isn't.
2016:
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2018:
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There aren't many pictures of the events, but the closer you get to 2020, the more and more you can see them inching their way into the forefront.