Imagine our surprise when we realized that not only did the paper not reveal anything new (Satoshi mined many of the early coins -- Eureka!), but that in order to do their analysis, they scraped the entire blockchain explorer web site to access Bitcoin's transaction history, and then commented on how difficult it was to access that history.
So little was their research and understanding of how Bitcoin works, that they misunderstood its most fundamental property: the shared public ledger that sits on the desktop of anyone running the reference Bitcoin client.
Unfortunately, it looks like they're after publicity, and not new knowledge. A big disappointment.