They just went with the PHB/Sword Coast Guide or? You have options to make a High Elf, as Wood Elf and a Drow. And High Elves that look like either a Moon Elf or a Sun Elf (Wood and Wild Elf don't seem to be different in 5e anymore) in terms of skin, hair and eye colors.
The game generally seems lacking non-visual options and background information for your own character, and in comparison to what they have been doing for the companions. But visually I think you have all the options to make all the current major elf subraces in Forgotten Realms. Mechanically there is not difference between Moon and Sun Elves anyway.