So far as I can see, this is just bitcoin fans trying to discredit a paper co-written by Adi "I helped invent RSA" Shamir which is somewhat unflattering to bitcoin.
Jeff Garzik makes two very important comments. First, that the blockchain is not a website and is very easy to tinker with as it is. Second, that many "rich" bitcoin owners might very well be web wallet servers that do not really "own" bitcoins, but simply store other's money in their vault (like in old days banks were storing gold).
Calling this "peer review" is less funny than being a security expert and parsing HTML to get the blockchain.
I would also guess that Ron and Shamir didn't look too deeply into the Bitcoin community since they use slightly different terminology, but the paper is still interesting.