Truth vs. Fact

Well, I disagree with both of these statements and I think you are falling into the same "subjectivist" trap that Fresky has when you make them.

Truth does not depend on what we "say" or what we know. That is subjective and irrelevant to "truth."

It's not what I "know" that makes a thing true or false. Nor does my inability to prove a "fact" make it untrue.

I can assume, and even claim to "know," that the universe would still exist even if the entire human race went extinct. I can't literally "prove" that. I can't be said to "know" it from personal experience.

I could be right, or I could be wrong, in my assumptions and conclusions, but either way, the universe either would, or would not, still exist in that event.

That would be the "fact" (or "truth"). It couldn't be both true and false--it's one or the other, even if we can't know or prove which one is "true."

The same analysis would apply to any statement I make, such as, "there are unicorns living on the surface of a planet (which we have detected) 10 light years from here." There either are, or are not, unicorns living there. Only one of those two possibilities can be true. It doesn't depend on what I know, or can prove. The one that comports with the actual facts is true. The one that doesn't is false.

To quote from the OP....

....Had the questioner actually explored those theories (e.g.https://plato.stanford.edu/entries/truth/) he/she would have covered the ground that the current posts are skirting round....
(emphasis mine) ....
....This potentially raises secondary points about (a) the transient nature of "I" as a possible succession of observer states and (b) the human urge to seek 'certainty' or 'unchanging absolutes' which commonly manifests as religious concepts such as 'an eternal entity'.

I therefore repeat that without anchoring their comments by reference to both the 'theories of truth' or by addressing the secondary issues, respondents will tend to play what Wittgenstein called 'language games' because the words 'truth' and 'fact' will have shifting connotations both within and between speakers as the thread progresses.

"a fact is something like a science statement that has evidence both for and against it"- Religion too.

Trust the words of Jesus, instead.