I replaced all my comments with the same phrase before deleting them with PowerDeleteSuite. The comments were fully restored and visible through a google search (but not visible through the user page). My posts were not restored, AFAIK.
This was during the whole 3rd party API thing. Maybe it was just something done during that time, but they certainly got around the edit replacement trick before.
You better double check. I just found out that only my comments with few upvotes are still that way, the others have been restored.
A script replacing them with random words might do the trick.
I replaced all my comments with the same phrase before deleting them with PowerDeleteSuite. The comments were fully restored and visible through a google search (but not visible through the user page). My posts were not restored, AFAIK.
This was during the whole 3rd party API thing. Maybe it was just something done during that time, but they certainly got around the edit replacement trick before.