Editing from multiple accounts isn't really verboten - they can't really prevent it, so they don't really try. All they can do is take ineffective punitive measures against those who are "caught" doing it "abusively," though of course, to avoid getting caught it's best not to seek election to the Arbitration Committee in the first place.
After the Essjay scandal of two years ago, Jimmy Wales put up a lot of talk about "credentials verification," which turned out to be vaporware, as usual. The media fell for it, though, hook line and sinker - giving Wikipedia all the benefits of media coverage without the inconvenience of their actually having to fix anything. (The media didn't follow up on it, either.)
I just hope that whatever happens in the wake of this little kerfuffle, reporters won't just accept whatever nonsense they're told about how Wikipedia "intends" to deal with such abuses. I can assure any journalists and bloggers reading this that they intend to do nothing whatsoever, for as long as they can possibly get away with it.