"They have little microphones inside the mask, taped to their head," he continued.
"And there's the combination of this microphone and that microphone (pointing to a hand-held and taped variety) for different sounds."
Judge Jackie O also spoke out about lip-synching accusations last month, telling The Advertiser: "I’ve seen a set malfunction happen and something fell on one of the singers and the singing stopped straight away.”
"They are singing live – 100 per cent fact."
Furthermore, Gretel Killeen, who was unasked as the Octopus early on in the series, told The Project what it was like to sing from within a costume.
"The microphone is inside the mask and it's live. It's an amazing audio feed, it's like singing in a cave. We are singing live, because people said "they're lip-syncing", but seriously, no."
Last night, Cody Simpson was crowned the winner of the competition after he was revealed as the celebrity underneath the Robot costume.