I suspect that Mr. Radi would have been safe if he had 1) used a PinePhone, with cellular and WiFi radios turned off, and a USB-connected cellular modem; and 2) hit the Internet through a VPN, Orchid, Tor or LokiNet.
If you think not, please share, because I hate spreading BS.
Edit: Well, someone seems to think that I'm wrong, but they aren't saying why. Just sayin'.