This is pretty hilarious - when I asked ChatGPT to "summarize this article: https://archive.ph/hOYMn", it said it's about Jesus ("The article traces the development of early Christian Latin hymns, especially focusing on how themes about the Virgin Mary and Christ evolved from the 4th to later centuries..." (https://chatgpt.com/share/69d48476-9bf4-8327-8c19-709865a547...)
Interesting. If you look at the sources it cited, there are a few links about "Sacred Songs and Solos" (likely from related/side content on the page), my guess is it didn't read the main article and instead anchored on those and hallucinated
I wouldn't be surprised if the owner of that site has AI scraping protections enabled.
Sharing what an LLM has to say about a thing is like sharing what you dreamt of last night — no one really cares.