...... No interaction was found between storage time and pre-warming profile for hatchability and chick quality....so a null result.
Since this is a summary of a paper, and not a full paper, I think that sentence is taken out of context, and is referring to no difference between the pre-warmed chicks and the control. I've also found two other papers supporting this technique, although both of them refer to the 4h and 24h warming and not the 30 minutes.

yay!