I was hoping the latest Platform update for my C-8 Pro (2.4.0.147) would address this, but apparently no one is aware.
While I do know that changing the Zigbee channel will prevent the alert from triggering, I've noticed that the Dismiss link doesn't do anything other than link back to the current page (e.g. http://127.0.0.1/hub/edit#)
I've also noticed that even if I disable Zigbee on the hub (as I've got no Zigbee devices in my infrastructure currently), the alert still shows up.
Yes, we as users can ignore it, or perform the channel change workaround, but it would also be nice to actually be able to Dismiss the alert, or have it not even trigger if Zigbee is disabled.