Dude, just check it. It's not a video. Just go on his youtube channel and go to "Posts." Mossy goes by he/they pronouns too.
It was a little mistake. I have called Mossy by his correct pronouns in the past, but I think that while reading the comment and seeing the "she" in it made me forget.
Yeah, I get it. It happens
I got confused for awhile too until I saw someone correct the pronons