Interesting take. When I first read this article I admit to buying in to the sensationalism a bit -- but I'll have to agree with you that The Darknet really hasn't changed this situation significantly, rather it's just introduced a more convenient route for would be malicious insiders.

Also, from another perspective (as you explain), it's actually made it easier to catch such insiders, due to the open nature of these markets (regardless of the fact that they're 'Dark' or believed to be anonymous).