Thank you for the link. It is always nice to see new video.
I think they record a lot of performances but my guess is that most of it is not "broadcast quality" video, or is not done with a professional video crew. Of course, we as fans really don't care about all that -- we just want to see it all.
At the start of the clip, and later, also, it looks like Lynn is on stage (at the left) with the others and I see Sarah and Edel later, also.