"Jeff V." of Lulu.com responded to my last correspondence with more of the same. Here's the relevant chunk of his correspondence and my reply:
Jeff V.: Please be reassured that Lulu holds no rights over the content you published and/or you retired. We will not distribute or use private, retired, or any content not made available for distribution within your account settings.
Me: You've already done this. That's why I wrote you to begin with. In fact, Google indexed the private work Lulu.com made available on its web site. Would you like to see my screen shots?
Jeff V.: If you use the Site after Lulu has posted a change to these terms on the Site, you are agreeing to be bound by that change.
Me: That's a nice way to rope users into changes that don't benefit them and then force them to accept the consequences. So I'm bound by the member agreement in force now. There still isn't anything about the law you cited in your first response, and Lulu.com is still in violation its own ToS by having published my private work against my will.
I went on to provide links to my blog entries about the matter and warn Lulu.com not to tamper with my account or the projects in it again, indicating that I would report the company to industry watchdogs if it did so.
Directly after I sent this correspondence, I received an auto-responder that said my ticket had been closed and was no longer being monitored. So I started a new ticket, but I had to submit it twice because the Lulu.com web site reported that its ticketing system was having problems.
Honestly people, stay away from this company, and remember that you can revise your projects to contain whatever you want. Let the company sell your gibberish if it insists upon keeping your work against your will.