There's a few details crossed there. Victor Gutierrez is a Chilean journalist who wrote the book about MJ's relationship with Jordy Chandler. He apparently received assistance from an unnamed Chandler relative in the researching and writing of the book. In addition, he wrote about MJ's past relationships with many other young boys. As you noted about the manpon story, he also included accounts from some of MJ's former employees about what working and living with MJ entailed.
F'loons love to claim that Gutierrez' book was banned in the US because MJ won a libel suit against Gutierrez. That's almost completely wrong:
1. The book was never banned in the US. It was available for sale as long as it was in print, and used copies are still available for a steep price. (Not to mention the US government does not ban books or other publications, except for those which violate criminal laws, such as kiddy *advertiser censored*.)
2. MJ never sued Gutierrez for this book. To this day MJ has never filed suit about any details related in the book.
The libel suit MJ had against Gutierrez had to do with Gutierrez claiming he'd been shown a videotape showing MJ molesting a young boy. That claim was picked up and reported on by Diane Dimond and the tv show Hard Copy, which led to MJ suing Paramount, Hard Copy, Dimond, and Gutierrez. MJ lost his case against Paramount/Hard Copy/Dimond because they were able to demonstrate they'd reported the story in good faith on the basis that Gutierrez had been a reliable source in the past. They'd also reported that the authorities were investigating the tape allegation, and the authorities (in the person of Tom Sneddon) confirmed that was true. They hadn't found a tape, but they had indeed investigated. That left Gutierrez, the source of the tape claim, to prove it, and he was unable to do so. According to Gutierrez, the boy victim's mother (related to MJ) was pressured into retracting her story, and the tape disappeared. According to MJ, there never was such a tape in the first place. The jury found for MJ since Gutierrez couldn't prove his claim.