Again, those were not previous in game faction exclusive race capitals. If it’s not in the game yet, there’s no limitations on whether it’ll be neutral or not.
What Blizzard is doing here making part of an in game faction exclusive race capital neutral IS Alliance bias at its most pronounced. I expect it to be addressed though when Exodar becomes 2/3rd neutral in Last Titan.
What needs to actually change are the neutral flags in Silvermoon. They’re all HIGH ELF flags. That is such a spit in the face to Blood Elf identity considering there are hardly any Blood Elf flags in the city. Blizzard needs to make these flags actually neutral with a fusion of red and blue to show neutrality and respect to Blood Elf identity. Make the top and bottoms of the High Elf flags to represent the temporary alliance between Blood Elves and High Elves.