It is a "fact" that my car is outside in the parking lot. This "fact" is only true, however, so long as my car remains outside in the parking lot. But it will not remain there. It will move, and then the fact that was once true will no longer be true. Because it's truthfulness depended on a set of other facts also being true (facts involving the where, and when, and what).
So, a whole set of facts were being assembled into a probable (acceptable) vision of reality involving my car. But the facts are constantly changing as the reality that we exist in is constantly changing. And so the truthfulness of those facts depend on the ever-changing facts they are being associated with.
OK, I'll continue for a while, as what you write here is understandable.
Everything you say here is correct until the last sentence above. These facts remain true if we add enough precision. The car was in the parking lot at a particular time, or span of time. That will never change and will always be true. It then moved to somewhere else that is also true and will remain so if you specify the times places and so on accurately. Yes, it can be complicated, but that adds to the difficulty of constructing an accurate description, and does effect the possible existence of such a description.
So, to your last sentence. The truthfulness of the facts doesn't depend on the fact that they are changing. What it depends on is our ability to measure, calculate and state the various factors involved.
This is why facts do not gain us access to the whole, or to the absolute truth of anything. And why the accumulation of facts (knowledge) does not provide us the "real truth" of things, either. They only gain us a relatively (and momentarily) truthful illusion that we then call "reality" to act on. And sometimes that works for us and sometimes it doesn't.
On the contrary, facts are the only thing that give us any hope of arriving at a better (I won't say absolute) version of the truth. And the accuracy of the facts themselves depend on our ability to determine them. And that depends on the methodology we use. Science, I'm afraid.
It's true that many data points (not facts yet) are momentary and fleeting. So we attempt to gather as many of them as we can to obtain a better overall set of facts. The more we gather and the better our interpretation of them, the nearer we get to truth, or accuracy might be better.
I will admit, if it helps, that our understanding of the physical world can be limited, for many reasons. To me that suggests that we need to get better at observing and interpreting.
Does this help to clarify my assertions for you?
Yes. Now let's move on if you wish, as facts are just one part of your argument I believe. I won't attempt to anticipate what you will say.