Probably true, but don't forget there's a common type of software piracy that open source helped -- companies using open source without adhering to the license. Many hardware and software makers have been caught illegally using open source software (the copyrighted works of others) in their offerings.
Of course, GE will say that the prosecution of these pirates is wrong, just FSF strong-arming.
Though I was thinking more along the lines of people pirating ISO images or exes of major-ticket items by PnP methods such as Warez and Kazaa or by torrent (e.g. AutoCAD, Photoshop, MS Office, Windows, etc.)