Forum:KB:Jedi Killers

Im not sure if this is the right place to ask this question but I'm not sure where to ask it. I am wondering why the article Incident on Tatooine is considered canon? Granted I have not played the video game but I have read the book and watched TPM multiple times and don't remember where Qui-Gon killed anybody on Tatooine. Is there anything i'm missing or is this an error?