If you're going to be technical, Boyd never posted to "Googlegroups."  Google Groups did not exist at the time.  Boyd's posts were to rec.gambling.poker, which is currently archived by Google Groups, but is not Google Groups itself.  Reading WP:BLP, I'm not sure how Boyd's own Usenet posts can't be included.  It says: "Never use self-published sources—including but not limited to books, zines, websites, blogs, and tweets—as sources of material about a living person, unless written or published by the subject," and these Usenet posts were written by Boyd. 68.81.192.142