I remember reading all that stuff too, I think I might have started that argument by complaining about how the new game doesn't look different from DOA4 if I remember correctly =(.
Anyways, the video says from 2-4 were mostly the same models, and that this time they wanted to change that a bit. I think there was just some confusion on the specifics in that argument. The new game definitely has upgraded models (or at the very least, updated faces and feet) and it looks like they added some new animations as well (judging by what he said in that video randomguy posted).