Behe is a creationist that came up with the theory of irreducible complexity as a counter for evolution. I would like to see the source where he said that he switched to being an evolutionist, though. That would be news to me.
Actually, that's no new thing. Back in 1996, while
arguing in favor of irreducible complexity, Behe wrote:
I want to be explicit about what I am, and am not, questioning. The word "evolution" carries many associations. Usually it means common descent -- the idea that all organisms living and dead are related by common ancestry. I have no quarrel with the idea of common descent, and continue to think it explains similarities among species. By itself, however, common descent doesn't explain the vast differences among species. ("Darwin Under the Microscope," 1996, emphasis added.)
See also the reviews of
his latest book. David Snoke writes:
He carefully examines the data of evolution, along the way making an argument for universal common descent that will make him no friends among young-earth creationists ...
However, he does continue to believe that God ("intelligent design") is behind the process, and that irreducible complexity is evidence of that.