@wisemanjaw
I have a RLN12W that has 10 cameras attached to it. Some WiFi, some PoE (including two of each Duo2 (WiFi) and Duo3 (PoE)). The RLN12W has an option to disable the "IoT" which may address your concern. Not sure about the other NVRs Reolink offers, but I would assume that almost all of them would have the option directly on the NVR. My RLA-PS1 does not have this option, as it is a passive device. I can not disable this from my desktop Client or iPhone app.
The other option would be to disconnect whatever you're using as a "hub" from the internet. I have heard of others do this and something I've considered myself in my use case.

Is there a way to disable this directly from the camera, if you do not use a specific hub (such as in the case where you are using a microSD card instead of an NVR)?