That one does show a loss of signal but I still have difficulty believing that switching off the controller activates Smart RTH rather than Failsafe RTH.Oops ! wrong file attached.
In that flight I tried for the first time to put the RC into a metal can but failed to break the radio connection. Subsequently I downgraded the drone back to CE mode, flew the drone further away, put the metal can inside my car and close the car door to force disconnection.
I guess I'd have to do some testing myself to confirm one way or the other.