sounds like its been either well built or its owner/builder can talk the talk;)
9k on any engine is quite an achievement, especial on a long stroker such as the 2JZ, and considering Toyota's rev limit 2k less, im not saying it cant be done, just i would not wined an engine up that far unles i know it will take it, with out seeking advise off another experienced 2jz engine builder you only can go on the current owner and builders words
i am by noway an expert though, i have managed to blow up every engine i have built:( and the in the link the guy is banned and the pics dont work:p