We don't know yet how the Ars article was created, but if it involved prompting an LLM with anything like "pull some quotes from this text based on {criteria}", that is so easy to do correctly in an automated manner; just confirm with boring deterministic code that the provided quote text exists in the original text. Do such tools not already exist?

On the other hand, if it was "here are some sources, write an article about this story in a voice similar to these prior articles", well...