In an interview with Der Spiegel, Williamson is beginning to try to find a graceful exit.
The problem is that he presents himself as having been "convinced" by the documentation he read in the 1990s. Anyone who would have encountered such stuff and was not anxious to climb aboard the denial bandwagon who have said: "Whoa, I better check these guys out" rather than jumping on their bandwagon whole hog.
Actually, if the SSPX did not have Williamson they would have to invent him. He has taken the spotlight off of their very particularistic views.