Hes supposed to be a credible source, hes an educator, hes the modern day Bill Nye. It's very hard to take anything he says as objective truth when his research and fact checking consists of asking an LLM. Considering hallucinations and straight up lies are not only common but not even unexpected for an LLM you can't believe anything that comes from one nor can you believe anyone who uses one.
It's not the library, it's the cache you never clear. She could have done this just as easily at home on a browser with a private window she hadn't signed into.
Thank you