The model is not "open source". That is just some Python scripts and tooling to run the model. There are a million of those already.

That's still not source code according to Stallman's GPL definition. Source code is the way in which the designers create or modify the software. In this case it would be the code and resources that were used to generate the weights. Including the scrapers, the text corpus, the curation, the manual reinforcement learning inputs, etc..