I would still maintain that the solution would be to have LLMs doing 'research' (by querying news for recent events) to ensure they're checking multiple sources, and to be explicit about which sources there were, whether those sources had sources, and whether their claims were uncorroborated or unsubstantiated.

The problem, IMHO, is that the LLMs are happily regurgitating facts from whoever, wherever, whenever. Even with a centralization of trust, e.g. 'We know La Presse is reputable and can be given the benefit of the doubt', mistakes can still be made. Without the LLMs cross-checking what they learn the output is still entirely unreliable.