Has that been verified as fake?
I saw the exact same video with the original sound track intact, and there is no “FJB” content at all. I couldn’t find it again, but there is this one:
https://www.youtube.com/watch?v=ACzv6AHuBxk
The 3rd tweet of the video down by Matt Couch shows the video with the true audio.
Yes
There is are two videos.
The original and the edited heckle version
Matt Couch posted the real video on Twitter, they weren’t chanting FJB.