I mean I can link a conversation with Claude that says it knows about materials and various details on their various strength but I don't think that'll convince you of anything.
Indeed, it won't: I can link a conversation with XYZ-bot that tells me that I'm handsome and my ideas are brilliant and I'm en route to tremendous success. The point is that LLMs are, by design and current models norms, sycophantic and incapable of describing their own knowledge and workings/processes. This is not a matter of "my opinion vs yours", that's what few minutes spent legitimately trying to understand how this works will tell you.