Jut was not involved. < Lol.
Jut's website was a fan website for Runescape, and he copied/pasted that information from Kaitnieks' website (The creator of AutoRune, AKA the program used to spawn any non-stackable items). I don't know why people think Xx Jut Xx was Kaitnieks due to that article he posted.
SixFeetUnder discovered the glitch, and told a few people. Kaitnieks was involved, and a few others (Dylock, g0ne, etc). All of those guys were involved in cheating communities. I used to talk to Kaitnieks on MSN years ago, and a few other major people involved with that, mainly Dylock.
One misconception is that the items were duplicated - that is not true. They were spawned by sending invalid parameters to the server. Another misconception is that they only spawned specific items - also not true. They spawned different items as well.
There were several people who did not leak the glitch who made shitloads off of spawning other items privately, and using high alchemy on them.
Few facts:
1. SixFeetUnder did find that out of fluke, but he was involved heavily in cheating communities/cheating in general.
2. Same goes for Dylock, he wasn't a newbie to the cheating game.
3. Kaitnieks' main account was not involved in that. His main "Kaitnieks" was banned long before the "dupe" incident. I believe he was using a level 3 the entire time the spawning was happening.
4. James (Dylock) was promised lifetime membership by Andrew & Paul to explain how the glitch worked, and how to fix it. He was permanently banned later that day.
5. I knew Kaitnieks well in 2003, when I added him for help with SCAR (Shit Compared to AutoRune). We talked for a while, and we became friends after a good while of chatting

.
6. I knew Dylock, and he's a devout mormon. A lot of people hated him after what he did, and I don't blame them.
Oh, and here ya go:
(Yes, I knew Kaitnieks well, hence the reason why I currently own his account)