He said he was ready for a scrap with the airline.
"If Air New Zealand wants to go after me in court, fine."
Hradecky said the airline hadn't given him evidence his report was false and until it did, the report would stay online at his site www.avherald.com.
The Aviation Herald, which has around 10,000 viewers a day, has been cited in overseas media reports about air traffic incidents and disasters.
"I have several sources," Hradecky said. "It's absolutely reliable information. It was obviously a compressor stall. It was not an engine fire."
An airline spokeswoman said one of the engines experienced a short power fluctuation.
"The pilot could have continued on to Norfolk Island without issue, but made the right decision to return to Brisbane where engineering support is more readily available."
Air New Zealand chief pilot Captain David Morgan questioned Hradecky's credibility and said the Aviation Herald never contacted the airline before publishing the report.
"I intend to write to him because ... aviation safety depends on good, accurate information so people can learn from events."