I read a review of The Singularity is Near by Ray Kurzweil where it was described as seeing a table full of what appears to be very delicious food, but it is then revealed that there is absolutely some amount of dog feces mixed in with some of the dishes. You can't tell which is safe, and which is carefully crafted with dog feces.
An LLM in a peer reviewed journal currently has no place, unless it is part of an experiment where it is trained on the Journal's body of work and then tested for accuracy with future articles. As the tech progresses it may find a place but if it takes twice as long to fact check the LLM output it's saving nobody time and possibly hallucinating in hard to catch ways.