I don't think the argument is correct. Reasoning LLM will check itself and search multiple sources. It's essentially doing the same mental process as human would. Also consulting multiple LLMs completely breaks this argument.
So a reasoning LLM that does the comparisons and checks “like a human” still fails the author’s test.
That said, this still feels like a skill issue. If you want to learn, see opposing views gather evidence to form your own opinions about, LLMs can still help massively. You just have to treat them research assistants instead of answer providers.