Obviously, they caught the bug and didn't deploy it.

The point is that a change to a completely unrelated component caused a latent bug to make the device unusable, ended up delaying a release for weeks and causing them have to pay me a bunch of money to fix it for them.

If they'd been applying upgrades, they would have never even known it existed, and all that trouble would have been avoided.

I mean, I'm sort of working against my own interest here: arguably I should want people to delay upgrades so I can get paid to backport things for them :)