One nuance about facts is that they change over time as we learn more about whatever the fact is about. Take SARS-CoV-2 for example, our best scientific knowledge about it has changed significantly since the start of the year. Some _facts_ from January would be considered _misinformation_ now. You might say that the actual facts are the underlying truth, but even that doesn't help. Our current view on the underlying truth are what is widely considered to be factual. The underlying truth can also change, for instance as the virus evolves and takes on different characteristics. Fact checking is most definitely not solved and I would posit that it's fundamentally intractable.