I think the author's whole point was that "some level of RBAC" is not good enough. And that assumes silos. Once you try to integrate, you wind up falling back

I think the author's whole point was that "some level of RBAC" is not good enough. And that assumes silos. Once you try to integrate, you wind up falling back on God accounts belonging to the integration layer and/or the database. It is surprising how many people still do not realize what a huge antipattern that is.