Something is mentioned there that either was not mentioned in the Wired article or I missed it: Anaya admits that he knew particular customers were buying compartments for illegal purposes. He just didn't know what particular illegal use they were going to be put to. He's basically arguing that to "knowingly" join a conspiracy, you have to know its objectives and scope, and he says he lacked that knowledge.
It's probably a bad idea to do business with people who want to use code words when they talk to you on the phone. The appeals court mentions an intercepted call where Anaya told the drug traders he could put "3 speakers" in a Camry for $2,500, where "3 speakers" meant a compartment to hold 3 kilos.
His sentence is way too long. He's not the lynchpin of the drug trade the prosecution made him out to be, but he does not appear to be quite the innocent bystander Wired makes him out to be either.