Just to follow up a bit, it does seem that most of the pages from the SGI thread are still in the Google cache, as well as the Bing cache.
For example, the thread on Desteni seems to be saved now, using the Google and Bing cache.
If you search for this phrase in Google or Bing, many threads come up. The second link is page 300, if you press the CACHE button next to the link, which is from
Forum: Former Cult Members and Affected Families