The point is that bitcoins have been hyped up as anonymous money to buy drugs so lots of dealers should have bitcoins which makes it surprising that they haven't found any to cease before. Nothing here happened to his bitcoins that wouldn't have happened to anything else he owns.
(cringes at typo) Okay, it's not anonymous money exactly, but it is money that can be traded without being associated with a real world identity. As far as "dealers" and "drugs", that's separate -- bitcoin is popular because it's resistant to seizure -- once a sale is made, the government has to seize the account it currently resides in. It can't simply go to a bank, serve a warrant, and say, "all your base are belong to us." A far cry from, say, Paypal or any other financial service. And large amounts of cash now is considered evidence of drug dealing even when no drugs are found, and can (and have) been seized.
Resistant doesn't mean immune. Bitcoin is resistant to all of these problems. Now, as far as drug dealers and such go -- they're using Tor and hidden services. bitcoin naturally extends this because it is hard to seize, and you can't simply serve a warrant to say, PayPal. There is no central authority for serving warrants to seize the accounts of bitcoin owners -- you have to get the computer, or you get nothing.