It's some interesting bit of lore. 7000 steps to reach the Grey Beards. Interesting theory, but I don't want to sit back and count to 7000 when they clearly stated there will be that many and they expect us to check.
I won't be counting. They said there're 7,000 steps so there probably are, but I wouldn't care either way. If there are precisely 7,000 steps....then the Nords were big on precision.
If there aren't 7,000 steps, then they're more like normal humans. We name stuff for the sake of exaggeration allll the time. Millipedes, for example, totally don't have 1,000 legs. But they do have a [censored]load.