well, the feeling and meaning is odd in the above interview.
IF the radios were working "just fine" then why couldn't they talk to anyone? even if given the wrong frequency, you go back to the good one, or look at your chart and find the nearest ATC facility and call them and when in doubt, 121.5mhz.
and according to the US AIM, check out sections 6-4-1 (2,3), : if an aircraft with a coded radar beacon transponder experiences a loss of two-way radio capability, the pilot should adjust the transponder to reply on Mode A/3 , Code 7600.
this does not say: equipment faliure.
it goes on to encourge use of 121.5mhz and ARINC and listening on VOR's.