I think you might be confused about the expression "world model". In this context it clearly means that a person has an understanding of reality based on "math->physics->chemistry->biology->psychology" instead of "peer pressure->group identity" or whatever you see in QAnon or cults or whatever.

If a person primarily evaluates the truth content of a statement based on identity or something instead of math/physics/etc then that person has no "world model", and vice versa.