It makes sense. The project did sort of grow out of Urbit, but there are fundamental differences in my mind that are less salient to people who haven't gone deep on Urbit and Pallas - this is very understandable. There are only maybe a few dozen people on Earth who could articulate the nitty-gritty differences between Urbit and Pallas, even though they seem huge to me lol The technical docs are the best writeup we have:

System Overview | Pallas documentation

Pallas is a stack of technologies. At the bottom lies PLAN, an evaluation model. On top of PLAN we have two separate stacks: on one hand Rex and Si...

but there's also this (sort of old now) comparison of Urbit and our project (which at the time we were referring to as "Plunder"):

Vaporware Blog

Plunder, explained for Urbit users

This article is a high level introduction to Plunder for the interested Urbit user. Plunder is fundamentally working towards a similar set of goals...