I'm sorry if I'm coming across as condescending, that's not my intent. It's never been "as simple as just throwing more data and CPU at the problem". There were algorithmic challenges for every LLM evolution. There are still lots of potential improvements using the existing training data. But even if there wasn't, we'll still see loads of improvements in chat bots because of other techniques.
Edit: typo
No, a chat bot as it's talked about here is not an LLM. This article is discussing limitations of LLM training data and inferring that chat bots can not scale as a result. There are many techniques that can be used to continue to improve chat bots.