I also conclude that the writer was quite a long way from the Arctic Circle at the time the observation was made. It happens that I've also been to Eagle Summit, which lies at 65.5 N, rather more than a hundred kilometres from the Arctic Circle.
Sauðanes in Iceland, where I made my own observation of the midnight sun on solstice night, is at 66.25 N, four times closer.
My observing location was much closer to matching your requirements for a "sunny midnight" than was the location in this rather opaque report, and yet I observed the sky to be blue. What do you conclude?