When you say "straightforwardly false", do you intend to refer to any particular theory of truth? While I have long known of different philosophical concepts and theories of "truth", I've only recently been introduced to the idea that some significant fraction of people don't understand the words "true" and "false" to refer at-least-primarily to correspondent truth (that is, the type of truth measured by accurate reflection of the state of the world). I am not sure if that idea is itself accurate, nor whether you believe that thing about some/many/most others, or what your individual understanding of truth is, so I find it hard to interpret your use of the word "false".
You can describe metrics that you think align with success, which can be measured and compared in isolation. If many / most / all such metrics agree, then you've probably made progress on discourse as a whole.