You can only say this if you didn't listen to the debate, or else didn't pay any attention to what Craig said.<quoted text>
Craig's argument is not from incredulity, and trying to dismiss it as such is the dodge of a simpleton.
There were any number of times in Craig's rebuttal to Carroll, and in the Q&A session, where Craig responded to some point that Carroll had made by saying (something like) "I just don't see how that can be." And would leave it at that.
In other words, Craig was expressing his incredulity, and was using his incredulity as an argument.
And only a simpleton would claim it was otherwise.