but I do think if one makes a webpage stating somebody owes you a lot of money I feel you should sue that person (and drop the webpage) and not just talk about it.
Most (if not all) people listed on said page were hired/contracted/whatever by Thendic France. Thendic France is no more, it went down with its parent company Pretory SA in 2003. Some of the people listed on the webpage might have been hired/contracted by Genesi Luxembourg, others might argue that Genesi Luxembourg distributed or used their work after Thendic France went down - but Genesi Luxembourg is no more. There's also Thendic Deutschland (closed down in late 2001 IIRC) and Genesi Switzerland (executive officer: David Gerber himself).
I'm not saying these people *are* actually owed money - I don't know about that. But under these cirumstances, suggesting they should "shut up and sue instead" is a rather useless advice - all they could sue are letterboxes nobody empties anymore or company corpses ;)