As I said, Mongoose's editorial processes sometimes fail to keep the distinction between settings and rules intact. They are getting better about this and have expressed a desire to do even better going forward.
The Type A actually predates Charted Space. So that's kind of a chicken & egg sort of thing.
Anyway, if you want to bend Charted Space to suit Mongoose's rules, that's fine. That's what IMTU is all about. But nobody is lying to you about Charted Space because Mongoose changed the rules.
As an aside, before you invest too heavily in calculations based on Importance, keep in mind what it doesn't do: take into consideration trading partners. A world with the Imperial Capital's stats has the same Importance and derived stats whether it is the center of the Third Imperium or a world in the middle of the Great Rift, more than 8 parsecs from any other.
The Type A actually predates Charted Space. So that's kind of a chicken & egg sort of thing.
Anyway, if you want to bend Charted Space to suit Mongoose's rules, that's fine. That's what IMTU is all about. But nobody is lying to you about Charted Space because Mongoose changed the rules.
As an aside, before you invest too heavily in calculations based on Importance, keep in mind what it doesn't do: take into consideration trading partners. A world with the Imperial Capital's stats has the same Importance and derived stats whether it is the center of the Third Imperium or a world in the middle of the Great Rift, more than 8 parsecs from any other.