The wording is weird. But the project (openslop) defines permissive as basically having a path for AI to enter the code. This lumps together both measured approaches like NetBSD's and fully embracing slop contributions in the same category.

I think this only makes sense if you view AI contributions as a taint, something that threatens the licensing of a project. In that optic, it really is an all or nothing. But it doesn't help users choose among the options as much.