Reading that article, it seems that Gaiman is saying that he didn't realize something that he thought was a purely sexual encounter meant something more to the people he was involved with, and he obviously denies that there was assault involved.
The problem with that is the similarity between the different stories the women told. In order for the stories not to be true the women would have had to coordinate their tales and that seems unlikely. He also seems to imply that Amanda Palmer had something to do with this, or at least a line in the article implies this is the case.
As much as I'd like to take Gaiman at his word, I find it very difficult to do so.