What I find fascinating is that he said you can just get a wireless camera that encrypts and stores to an SD card if you want a camera.

I just spent two hours looking for such a device and as far as I can tell, unless you’re looking for a 1080p spy cam, nothing exists. All security cameras either need WiFi to setup or have cellular connectivity. There are PoE wired options with DVRs, but no battery powered just sit there and record options.