Ha just noticed the same thing!
Always enjoy your posts and glad to see you on the Exploration forums!
I am going to try to "divine" what he meant and guess that he is using a combo of the Galmap info, which tells what kind of star and how many stars there are, and galactic radius. The class and subclass of a star tells you the color temp and and a guesstimate on the size, which can give an idea of how massive or young the star is in question. When taken in combo with the location in the galaxy, these can give you a read on the statistically available material for planet formation and also a likelihood of what types of planets you are likely to find. For instance, the huge planets this guy is talking about are typically found around young high mass stars (OBAFs). The position in the galaxy might also impact how much material (eg solid material vs gas) is available for planet forming. Galactic radius definitely seems to impact the likelihood of finding ELWs (so why not planet size/density?), but the way the game works anything is possible anywhere.
All of this info is pre-generated on the galmap and visible from Earth even for permit locked systems. No idea whether the seeds are pre-generated or created when you enter a system, but in either case the seeds would have to pass through the filter of star type and location.
Good to see you, too, Ziljan. Thank you for explaining that. I still believe that exploration is woefully under-realized, despite this method. Seriously hoping Fdev gives the science roll some love in Beyond