Look, YEC are notorious for lying and cherry picking, almost as bad as flat earthers. The "Gish Gallop" technique is named after a creationist. ChatGPT is not know for giving the same answer twice. These aren't perfect heuristics, but it would seem rational to view the combination of both as logical poison.
I am not going to defend every YEC. But you are using too broad a brush. Read the book and decide for yourself. We did not use chatgpt to write the book; it was part of the editing process and we checked everything from chatgpt, because, as you said, it is not known for watertight reliability.