Didn’t you say this on your first reply?
So, which one is it? Is the server populations relevant or not? You might not like the numbers represented in realm pop, but they are collected through the Blizzard Api, not taken from thin air.
It very much is the players. You seen to have a fairly decent raid and mythic dungeon progress (at least compared to me), why not gather more like-minded Alliance players and continue that progress?
Why expect blizzard to give you an advantage when a gap of 209k players while both sides have well over 2m players at 120 it’s insignificant?