doesn't take a rocket scientist to see why they're saying this. all you have to do is use the various models to see within the past year they've all become noticeably worse for average consumer use. All the training data is out of date, all of it. The gaps between updates of said data have increased. They're out of data to consume and it took them too long to realize that feeding off each others waste doesn't work. combine this with the fact they're all collectively out of money.
You're better off just using a search engine at this point like you used to in order to get a solution. Because all these LLM's are hallucinating now to such a massive degree in a desperate attempt to provide the user with a positive solution.