I just ran the 'Traveller Worlds' generator, and got NO towns and estates. Same map, just sans the 'pink' icons.

This seems to happen when ever I click the link from TravellerMap. I think I've only had one planet that DID NOT have a town and estate on it, though I'm hard pressed to tell you which one.
Latest example would be 1227 Storr.

As the ref, I'm more or less adjudicating all instances as actually having a Pop 0(no people), per the map.
I found it really odd that there were 'estates' and 'towns' on empty planets.
I'm aware of the 'zero' event that took place in the early 2000's, but have never found/heard of the reasons behind the event.

Population Zero planets(Storr sector), are showing Noble estates and Towns on almost all of the planets in the sector.
When you generate a planetary map.