Not true. In the usual method of crucifixion, as long as you could at least temporarily put some weight on the nail through the feet, then you could breathe and speak. But when the legs gave out, and you hung from your arms, then you found it difficult or impossible to breathe. That was part of the punishment, because instinctively the crucified person would then push more with the feet in order to catch a breath. This could go on for some time.
The Bible accounts suggest that Jesus managed to push up and take one last breath when he spoke those final words.
But, then, I'm afraid that O'Reilly is writing these books more for the money and the fame than for the truth. I can't say that for certain, since I didn't know he had already written two books, and now a third. And, I confess, I've never watched him on TV, since I don't watch TV.
I suspect the public will be subjected to a series of his “Killing” books.
Holding my breath till “Killing Garfield” is published.
What about the other two who were crucified with Jesus? They spoke also.