Technically, white wheat is a wheat grown specifically to not have the reddish tinge to it that normal "red" wheat has. White wheat, supposedly, has a slightly higher protein content than red wheat as well and a slightly different flavor. That said, I've only ever seen white wheat malted, never flaked, and a quick search found exactly nothing on three major brewing supply shops. So either you would need to buy white wheat and flake it yourself, or do what I would do and assume the person that wrote that recipe does not know what white wheat is. Of course, if they don't know what they are talking about in regards to flaked wheat, I'm not sure I'd trust the rest of their recipe myself.