I might misunderstood what he meant. Maybe he did mean the playable systems. That makes me wonder where they get all 400 billion names from.. It is said that most of theese systems are randomly generated, right? So how can that be? I'm just curious myself, and I'm open to suggestions.
EDIT: I'm looking for the material. Give me a moment to find it
Allow me to explain.
The game has most of the well known stars in the right place. Canopus, Barnard, Capella, Bettelguese, Rigel, LGM-1... and so on and so on. The thing is NASA catalogue is incomplete because they don't have all known "named" stars. There are different star catalogues. But I think the common named stars, such as the constellations are all there.
Thus they used the NASA catalogue or whatever catalogue to place and make these stars as they are in real life. They are still missing a bunch of stars which are not on the catalogue they used
Other problems are that for the most part we do not know exactly how far are most of the stars in the galaxy, we have an estimate. Only precise measures we have are for the most studied stars, but they are very few. We also don't have a name for every star in the galaxy. Most of them are given a name according to a catalogue naming procedure.
An example that the game is using one source for it's catalogue and not an exhaustive and scientific astronomical naming, is that they named the pulsar PSR B1919+21, LGM-1 which is a kind of nickname.
I think its because they are developers and not Astronomers (still an awesome job for developers) and because for 99%+ of all stars in the galaxy their distance is not well known and for most their "name" is just a number in a catalogue. Thus they named a few of the well known, put them in the right places and procedurally generated the rest.