at the time, Iain said it was "unfair" the BBC show was edited to make Diana look bad.
She was hit by a torrent of abuse when the episode aired and left the show the same week over health concerns.
Iain said: "I feel bad for Diana because she's had quite a mauling on Twitter and I don't like all the nasty comments that have been directed towards her.
"I think it's a bit unfair and I do think they could have edited the episode a bit better."
He doesn't believe he should have left the competition that week.
"It was more of a technical error than a baking error and it maybe should have been taken into account a bit more," he continued.
"There was a lot of discussion afterwards off camera between the contestants and a lot of the bakers thought they shouldn't have thrown anyone off the show that week because of the way it happened.
Iain adds there were "quite a lot of tears on the day", but he has no regrets.
"I don't regret throwing it in the bin. I would do it again," he said.
"I didn't want to serve something in that state. I'm not a complete perfectionist but I'm someone who likes things to turn out as I intended them to. It was more frustration."
Bake Off host at the time Sue Perkins defended the incident, saying: "Iain's Alaska was out of the freezer for 40 secs. That's it. No sabotage. 40 secs of normal temp would NOT be enough to reduce it to liquid."
Iain furiously binned his 'ruined' Baked Alaska Credit: WENN