Before everyone gets their knickers in a twist
The bike was revved to 4K as stated, that is about where emissions tests are done, so there is usually a bit of lean / timing trickery going on there, My Strom 1000 did the same thing, and there is a bit of an exposure thing with the camera going on as well. ::024::
Just running a small pedestal fan across the headers makes a BIG difference to that colour.
So Mark is right, and 528 is right as well. It just depends on how red and under what conditions.
I suggest everyone give it a try at least once. Makes you appreciate why headers turn blue.