I didn't read the text. You're right. It does say Honolulu.

But at 10,000 feet elevation, this observatory would have a horizon 100 miles away. So Honolulu, 120 miles distant, is below the horizon, seriously diminishing its light pollution. But I think I can see it on the horizon, a little to the right of the Moon's azimuth. It's directly above the blurry dome that was probably moving during this long-exposure picture. Its a reddish glow, and spans about 10% of the horizon.

But what I was talking about is the glow that exists across the entire horizon. The curved horizon suggests that this is a wide-angle photo. This glow is way too strong and too spread out to be produced by distant Honolulu. I tried setting up this sky in Stellarium and when I advanced time to get the same stars on the horizon as in the photo, it was just moments after Stellarium's sky became pitch black, and the last afterglow of sunset disappeared. But Stellarium gives me a 0 degree horizon, and at 10,000 feet, your horizon will be below 0 degrees altitude, perhaps showing you some lingering sunset glow.

But it is a bit strange that the sunset afterglow would be below Honolulu's glow. So this photo-spanning glow is probably reflected moonlight off the white cloud tops, rather than sunset afterglow as I had suggested.

Just my guess ...