As I understand it, his primary work is in theatre, film and T.V., and he's been really surprised and excited by the response he's received for his VO work, and for those two characters in particular (game nerds are best fans, natch). Since they're both now "retired" for the forseeable future, this video was his way of expressing his gratitude to the fans.
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This is your new existence. This is the new you. Welcome to the Wasteland. It will be your undoing.