I'm admittedly skeptical. The AI generated novels I've seen have been bad. Really really bad. It's been a few months, however, so maybe the landscape has evolved faster than I expected.
Is there a source you can recommend for further reading?
I've been able to write coherent stories a dozen pages long. You need to have it generate plot points and other auxiliary information about characters and whatnot and it does a pretty good job. Obviously it's not going to one shot all that yet.