IS has its shortcoming but I do agree with you that their claims need further elaboration.
Jonathan Hui

Yeah, I thought so — and the paper doesn’t substantiate the claim that the IS cannot be used. The same conditions would be used, yes — the idea would be to measure both parts of the IS with WikiArt. So in the case of using WikiArt, mode collapse = low diversity with respect to art styles (as opposed to objects in CIFRA). Would the Frechet Inception Distance also be able to be used with WikiArt?