ANC has mountains to the north east - these would not effect either the departure off 25R or the GA off 14 (either published or assigned heading to 300M).
"ICAO defines Mountainous Area as a gain or loss of 3000’ of elevation
within a distance of 10 NM."
I choose to apply ICAO operating considerations for Mountainous Area when operating at ANC due to high terrain in the vicinity.
0100LT on 28 MAY would have been a great twilight, given that there was a full moon (risen) on 28MAY.
The 0100 time is intended to offer you the idea that the crew is at the end of their best performance time line. It was not intended as a suggestion of atmospheric lighting.
...but thanks for clarifying your perspective.