The photos show the garlic unpeeled, but the recipe calls for them to be peeled. Can you really make a sauce with the papery skin still on the garlic cloves? After two hours, will it disintegrate?
When it describes them as 'peeled', it means to take the peel off (ie. "peel them"). Not a lot of recipes involved unpeeled (ie. with the skins still on) garlic, and those that do generally involve removing the garlic before serving. The papery skin will never become anything you'd want to eat.