[DiogenesKynikos]

We don't actually know that much about how the brain works, and nobody discussing intelligence will decide tomorrow that humans aren't intelligent if the details of how the brain functions turn out to be slightly different from what we previously thought.

LLMs obviously display what everyone prior to 2022 would have called "intelligence," before the goalposts started rapidly shifting with the release of ChatGPT. They can carry conversations about arbitrary subjects, understanding what you're asking and formulating thoughtful answers at the level of a very smart and extremely well educated human. They're not identical to humans (e.g., they don't have fixed personalities), but they display what everyone commonly believes to be intelligence.