If I understand him correctly he seems to think that taking an image from a work constitutes quoting it, which isn't really the case since the image is a work in itself and taking the whole thing and reproducing is not the equivalent of quoting a paper but to reproduce it completely.
Even if his assumption about quotes held the images in question would still not be free content, which means they can't be hosted on the commons[1].
1. There are some non-free images there however, but that's not relevant here.