Right now neural nets do pretty poorly with "loose/messy" styles (you get noise instead of brushstrokes; if they posted high-resolution images there, I cannot believe anyone would score less than 10/10.) Neural nets do exceptionally poorly with "neat" styles (try copying the style of the Mona Lisa into your photo and it'll paint an eye into your mouth.)
However, I'm pretty sure that an algorithm hand-crafted to replicate an artist's style might fool me (just like a hand-crafted chess algorithm wipes the floor with a neural net plus some tree search; not so for Go, I know - I don't even play Go so I don't have a firm opinion on that one.)
I must say that this whole "photo + style" thing really gets my goat - not the research as much as the sort of press coverage it gets. I project that a stock market crash will improve such coverage significantly.