Having a narrative reinforces the point that what you actually do depends on the entire context of the application. You would almost never be the one implementing cannot-be-broken-under-ANY-circumstances encryption. So you have to know what the circumstances are. In this case, the circumstances point to no-encryption-whatsoever!

Sure, you could point to other circumstances where something like what they're talking about would be useful but that's a million possible circumstances with a million possible encryption solutions and you've lost the useful urgency of the original concrete narrative.