I had to watch the video to see what the heck was going on. You're right, he is obsessed. He's apparently made an entire youtube career(channel) out of 'exposing' transgender or transsexual people.
I wanted to comment in the video, "Okay, so you've 'identified' her as a man. And for what purpose?" but after seeing some of the toxic crap in the comments, I decided against it. I'm aware of Twitch/Twitter/Youtube raids from toxic communities is a thing, and while I might see a large increase in viewership on my channel, no doubt it would be nothing but toxicity.
Do be careful, ladies.
But again, so he's tried to identify key physical differences between men and women, and what's the point...he is very obsessed.