3 and 4 are what that argument is based on, I believe. 3) on the basis that the output is not _reproduced_, and 4) on similar grounds that output that's just not at all the same as the input data isn't affecting the market for the original image (I think this is the more debatable one, but in general the existing cases have struggled at the early stages because the plaintiffs have not been able to actually point to output that is a copy of their part of the input, and this does actually matter).