Well, in this case it could be called "Stream sniping" or basically how something like that would be described uhh... I joined his lobby in an easier way, because I'm friends with him in VRChat, but this video was crafted with the footage of his Twitch live stream. Other "stream snipers" would need to do some more research to find the correct lobby.
I joined while I was watching the stream while at background aswell. Also, because he was on a map from Half-Life 2 and I imported this model into VR Chat.
While there's another video on youtube. The footage of that was also from a live stream, but I was unaware that the user is live streaming, this was literally something lucky.
I actually confused on who the video made with someone, I think they had Fitz's profile picture once that's why I remember it being from Fitz, but it's actually from a guy named Frisky. Someone found my name in that video and looked it up on Steam and told me about it.