I've heard that, but what also seems to be happening is my nord is also taller than everyone and has been since he beat miraak (or maybe that's when I started noticing)
...i dont think we grow any at any point height wise after beating him
every member of the races has a locked height, unless uniquely altered like tsuns model
so if your nord is around, say, dark elves, then yes you are taller but so is every nord compared to any dark elf or imperial or bosmer etc
the only thing thatd make you 'taller' than another member of your same race is if you had a hairstyle that made you appear slightly taller
if you had grown to the point where the ebony warrior looked normal sized to you, youd be the size of tsun (about 2ish feet taller than even a high elf) and your model wouldnt even be able to fit under some indoor areas like werewolves in some areas. most normal doors would come to about your lower neck