Yeah, you're right, it looks like he decided to put his personal number instead of the organisation's number (i.e. the organisation doesn't have a phone number) at the end of a press release. Don't call the number then.
It's by far the most complex Troll Kojima tried to pull, if it really is. Things to note:
On the wikipedia article, Sergio Canavero is a link that loops back to that same article.
his book, Head Transplantation and the quest for immortality, seems to be real, but it's self published through Createspace and is just 112 pages long, which for an undertaking that massive, seems to be on the really light side. Also, when you want to be taken seriously, you don't start your medical centered book with a quote from Frankenstein. That's just weird.
So yeah...I'm leaning toward the most complex troll he pulled.
Also, I can't find anything else than this story on Canavero himself. This is starting to unravel slowly.