Good luck breaking down the metals into a form that you can actually consume. Don't know too many people that can eat sheet metal, much less an aluminum block. And god forbid you own a Mitsubishi, iron block motors... then there is the fluid which would surely kill you after consuming.
Possible, just not logical.
As I said above, it really seems like he was just nerd-raging for a short while, and used that comparison as a silly way to vent. It's apparent he still is active with in the goldsource community seeing as he's played Urby's work, and was compiling a map of his own during the rant.