It makes sense that the Holy See's communication is predominantly direct (ie, letter-writing) rather than anonymous (looking up stuff on websites), but ignoring that resource would be foolish, of course. The official SSPX page apparently had some rather unsavory things to say that would not have been seen as in line with Nostra Aetate. I think it has since been cleaned up.
The timing of the airing of that interview was unfortunate, but sufficient 'vetting' would have found out Williamson's views.
I think it would be awesome to apply for a job at the Vatican monitoring blogs and looking up websites for them
.Edit: Why is my post invisible?!? Fixed - VtF (but your link doesn't work)