User blog comment:D. Cello/Animus Hardware code decyphered/@comment-3285453-20110613144922/@comment-89.101.231.54-20110614072954

It could just be retconned, Its likely Ubi wasnt sure of the direction they wanted to take with Desmond's backgroud. That or maybe he grew up in the Black Hills and then later his parents moved to a desert comune?