Earlier quoted context omitted.
Predicting whether a text was written by a LLM or not is not trivial. What was the latest number by OpenAI? 30%? As LLMs get better, it seems like we won't be able to distinguish real text from fake text. Your LLM will be able to summarize it, but it will still be 99% spam.
You don't need to predict if it what written by LLM, if it's a human or machine makes no difference to the validity of a text. You just need to be able to extract the actual information out of it and cross check it against other sources. The summary that an LLM can provide is not just of one text, but of all the texts about the topic it has access to. Thus you never need to access the actual texts itself, just whatev…
The problem comes in when 99.999999% of other sources are also bullshit.