I asked this question to myself a lot of times and finally decided to post it here.
If Lynyrd Skynard's open set was filmed, is there any chance that Queen's concert was also filmed?
No - the concert was not filmed. The crew removed the cameras and stuff before Queen entered the stage. Former Rockpalast creator Peter Rüchel said so in an interview. I think he didn't like Queen and/or the band gave no permission to be filmed.