"I didn't know the depth of feeling — I honestly believed hand on heart it was a good thing to do to save children's lives," Sir Ray told The AM Show.
He added that he'd assumed only about 20 people would be opposed to the event.
Three-quarters of submissions to the resource consent process supported the LifePod Appeal concert, as did 91 per cent of Aucklanders and 87 per cent of people living nearby.
Sir Ray has also been met with criticism over the LifePods themselves, following an article by the Newsroom website that scrutinised the product and claims surrounding it. Among a range of issues, the investigation highlighted the facts the LifePods did not yet have ISO certification as a medical device and production had not begun at scale.
It also raised questions over whether Avery should be leading the LifePods process, whether he'd been transparent enough, and whether any of the incubators would be actually produced soon after the concert.
Newsroom reported Avery acknowledging the one million target of babies to save was not exact, quoting him as saying: "When you're doing marketing you pick some figures out of the air."
Speaking to the Herald yesterday, Avery said this figure equated to the number of lives that could be saved by 2000 incubators over a 10-year period. He acknowledged the LifePod was not ISO certified — saying rather it was "certifiable"— but denied that any false claims had been made.
The LifePod's components had passed ISO testing, but now needed to be validated by an independent audit at the factory in Chennai, India, where it would be manufactured, he said.
"We can't sell it.
"It's got to be sold by them, and they will then manufacture it and distribute it," Avery said.
"We've got it to the point where we can now hand it over to the manufacturer, knowing with 100 per cent certainty that he can manufacture it and get the certification within a very short period of time."