I believe that Wm. Scott Anderson's thoughts are largely in line with those of the mainstream. From what I recall, I'm pretty certain that he wouldn't at all be considered a creationist, much less a young earth creationist.
His topic and arguements are focused on whether or not a "great flood" happened in geologically recent times. I don't think he is proposing that this flood was anywhere near the magnitude of what "Noah's flood" is generally regarded to have been.
Moose