It doesn’t actually involve circumventing anything. They are already downloaded to your machine. It is literally no different than the Glowforge logo you see at the top of the screen on this page.
Explaining to someone how their computer works is certainly not ban worthy, in my opinion.
And, while no one but Glowforge really knows the specific reason for the previous ban, it wasn’t likely because of educating users. It was most likely because he posted the actual file.