The tech doesn't sound that interesting at all. Every AI Degen thread on 4chan and similar has included model fine tuning instructions for a few years now, for the express purpose of cloning an existing artists style. I also find it interesting that they included a quote from an artist pointing out the hypocrisy of using an existing model, trained on unlicensed material, but never actually discussed that particular issue in the article.
I think you mean LORAs more than a fine tune. Yes, plus there are plenty of online resources to train a LORA as well, CivitAI you can just give it a bunch of images + labels and it just does it for you, the bar is pretty low.