It could very well be true, what you suggest!
Fact is that Arnhem was part of the Sumer outdoor shows. That leg of the tour had a different and bigger lightshow then the previous shows.
Eventually the show ended up indoors, but nevertheless they probably, logically used the lightshow that was travelling with them intented for open-air shows.
And yes, the gig has been recorded professionally from Say It's Not True up to Radio Ga Ga (with INTEND to make it one of the bonusses on ROTC).