Ydorb says he's public-domained most of his contributions, but rightly points out that other WP contributors were involved in the apparently plagarized version, and that the WP GFDL sharing license would require attribution anyways.
If you release your contributions in the public domain, there is no requirement to attribute it, whether it's also been released under GFDL or not, so I'm not sure what you mean by "anyways".