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My site:domain.com shows outdated URLs from 3-4 months ago, included as "Supplemental Results". These old URLs had '?' '&' '=' parameters. Current page URLs only have '/'.
Also a whole bunch of 'no title no description' URLs. Combine all these 'fake' URLs together with real URLs and you get a doubling of indexed pages without any "real" new page additions.
If that is not cheating, then I do not know what is.
Why am I complaining? With all those 'fake' URLs in the index - the traffic has actually dropped. Why? Well, "Supplemental pages" never rank well. And if Google decides to serve up a supplemental page instead of a real one - the rankings go down. "No description, no title" pages don't rank at all, however they do compete with the actual URLs in the Google index just the same.