I'd appreciate not being told that I've been doing it wrong for the past three years.
My view is that Nexus is whatever the hell people say it is. If some people say it's a city, it's a city. If some people say it's a planet, it's a planet. If some people say it's a giant, intergalactic were-seal that noms other planets for fun and profit, then it's a spoon.
Everyone's gonna have different interpretations, and I think it's probably better if we don't go around trying to decide on a 'correct' one.