I was actually (digitally) in touch with kimble and his BBS in my own BBS-days and feel a need to set straight that, to my knowledge, he was never very tech-savvy, and never a "hacker" by any standard. Instead he quickly made a name for himself for being a full-on fraudster of the sociopath kind.
Here's a (german) article that sheds some light on his earliest endeavours:
http://www.gulli.com/news/12565-nachruf-guenter-freiherr-von...
The gist is:
Kimble started out by running a warez-bbs and dealing calling cards (which was quite common back in that day). Things turned nasty when his BBS got busted. He did not only cooperate with the cops but there-after partnered with an infamous german lawyer to set up traps for other BBS operators and sell them (literally) to the authorities. This went on for years in an organized fashion. From all accounts that I've heard he was not strong-armed into it but rather made money that way and even bragged about it.
From there I think the ars article is mostly correct. But I wouldn't like to see him get away with his self-proclaimed "hacker"-image.
In the german BBS-scene of the 90s the hate for him was unrivaled. There were quite a few graphic kimble-related ascii-banners on some post-login screens.