It is debated if you need to cool antaresia or not for breeding, i don't know of anyone who has had success from not cooling, but the arguement gets thrown around a bit so i assume maybe a few have had unexpected clutches. I suppose anyone intentionally breeding are going to cool their animals, noone can be 100% positive that you wont get eggs from thhis pair, only time will tell.
From what i understand if the female isn't ready she won't lay eggs. People do breed antaresia quite small and apparently easily at 18 months of age.