No, the pump works perfectly fine without an app. At least one pump out there doesn't (the Omnipod), but in lieu of a smart phone, they give you a device (essentially a single-purpose Android)
The ability to bolus (administer insulin) from the app is fairly convenient, that's all. Since that's the biggest area of risk, that's the feature they disable until they've validated the OS version.
I assume you can operate the insulin pump without any app? Or do you depend on a functional smartphone on-hand?
Does the pump itself not have built-in safety features that the app shouldn't be a critical component?