Is this news? Everyone knows the "trap" for criminals using Bitcoin is the conversion to Fiat. The Fiat system is very regulated and monitored at all times. <ATMs and Banks are covered 24/7 by CCTV cameras>
Even if you simply trade bitcoins for cash on the street, you expose yourself to CCTV and also to the person that you are trading with. <This person might be a under cover agent or law enforcement official>
A criminal using bitcoins for his crimes, would be stupid to convert to fiat and using bitcoins for payments is also a bad idea, because all transactions can be logged and traced on the Blockchain.