I also got the email from LAP almost days after my thesis was placed on the library website (they must have a very organised system that searches university webpages daily).
I told them, politely, that I was looking into other publishers and have not heard back from them. I simply can’t understand why anyone with serious scholarly work would publish with these guys. I suspect that a book from LAP on your CV would rule you out of any tenure track position at a credible university. The desire to publish with LAP is even more bizarre when there are other, respectable, academic presses out there that will at least look seriously at your thesis (Peter Lang comes to mind).