Mesh uv Coordinates

A while back @nathanletwory posted a little script for extracting the uv coordinates of a mesh. I tried using it on several different “meshifications” , the vanilla GH Mesh Brep, TriRemesh, and Quad Remesh. It only seems to work with the first method, and subdivisions thereof. I’m curious as to why it works in the first case and not elsewhere?

Mesh (68.8 KB)