based on how misinformed the author was in general on the subject, I think its more likely the site dropped off the first few pages of results. Since it still came up when you search for the domain, it can't be deindexed.
Again, apologies for the imprecision. But you'd agree that it has been delisted for search terms it used to do well for?
Additionally, far less than <1% of the people who use Google get past the second page of results. Getting your ranking penalized by twenty spots is a death sentence.