More like an example of how their provisioning and documentation process is broken, you can absolutely have critical things on SIP (and PoE powered security cameras, etc), just don't forget to document it correctly.
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Sure. Absolutely. But if they'd been straight PSTN lines the abject process failure you've correctly described wouldn't have been able to put lives at risk because we'd have had to call the telco who most assuredly would have known what the lines were for, and we wouldn't have been able to shut them off. Safety critical systems need to not rely on humans doing boring, complicated things correctly for long periods of time.
> the telco who most assuredly would have known what the lines were for
yeah, about that...
Much more likely the telco would just have the business name for billing info for a POTS line and would happily shut it off.