The statement is equally hyperbolic both as quoted and in the original context. LLMs often can't quote sources, and those models are nevertheless useful to lots of people. Makes it hard for me to take the rest of the comment seriously.

A LLM that could quote sources would be even more useful, and in a world where both were available there’d be no reason to use the plagiarizing one.

that LLM is https://perplexity.ai

That was the whole statement. It doesn't have qualifiers left out

The comment I replied to was updated to include the second half, it was originally just quoting

> A model that possesses the entire collective knowledge of our civilization is useless

The additional context doesn't do any work.