I think you might be taking that number a bit too literally. What I mean is, it works enough that no one is complaining. But, all software has bugs. Some are logic/syntax bugs, and some are intent. "It should do this, but actually does that."

The sum of ALL of these classes of bugs is such that our clients haven't complained about the software being particularly faulty. It's impossible to tell if it's more or less buggy than it would've been written entirely by hand, but I suspect it's less buggy than it would be if written by hand.