I already did a TL:DR reply in the other thread. So I'll keep it short here.
Video is presented as the first video for their new acoustic album. The video is pretty lame and mostly fans singing over a random acoustic performance with nothing to do with the album. People react in confusion. Ryan is sad.
This. When I read "video premiere" I legitimately thought it was a video with at least the studio version of the song, so when I saw that it was just the recording of fans singing the song, I wasn't let down, I was just a bit confused. And the same -I think- happened to many other people.