I think the best answer is “no one knows for sure.”
That said, I think some truths are, as far as we know, absolute. E.g., 2+2=4, or the universal gravitational constant = 6.67300 × 10–11 m3 kg-1 s-2, or the speed of light in a vacuum is 299,792,458 meters per second.
I feel reasonably safe in assuming these are absolute in that they are not contingent on perspective, circumstances, or other modifiers. That said, I would not be entirely surprised if, eventually, one of these things was found to be inaccurate. I’m not sure that’s the same thing as “not true” but that is getting into semantics.