Ask HN: Simulation vs Generative Models - Any Difference?

I'm trying to get a handle on "Generative Programming"(GP) but AFAICT it appears to be no more than simulation via computer program, which has been around for decades (e.g., SIMULA language). Is there a difference? Here are some sites:

https://probmods.org/generative-models.html

http://rjida.meijo-u.ac.jp/prism/