I'm not familiar with these devices. Are they not capable of caching a little (15 seconds or so) of recorded video (or much more audio) for sending later when it re-auths with the access point?
Probably, but it would block the alerting feature they highlight in their ads. That said, I find motion detection alerting to be useless on outdoor-facing cameras due to vegetation, weather, and wildlife. The false positive rate makes it annoying.