User blog comment:KATANAGOD/Return for Debriefing - May 1st 2012/@comment-4863864-20120423110626/@comment-3285456-20120423132010

Actually the computer terminal is not Mason's memories but in fact messages from an annoymous tipster. However they don't actually say Reznov is alive.

HOWEVER: If you look at the Marverick Code (Named after the guy who solved the secret code) and take the first letter of each callsign and the numbers at the start of each mission in Black Ops the code reads something along the lines of 'Reznov is alive, no body was found - Is he who he says he is?"