To be fair that was the one instance they have him dead to rights, true.
It is a bit unexpected I suppose for a normally friendly party to be recording your phone call. He did work in a less regulated environment than banking so recorded phone call probably caught him by surprise. No one was that dumb at banks (most calls are recorded and there’s often even a beep to remind you the line is recorded).
Georgia literally has a recording of a criminal threatening to retaliate against a public official if they don't rig the election.