OP doesn't seem to be talking about absolutism at all. They're talking about how the stuff we know, including the theories you mentioned, still have underlying probabilities (uncertainty) that we can look at and be almost entirely sure, but never 100%.

It's like determining a sphere's superposition. We can probabilistically determine where a sphere is at by analyzing it in the context of an infinite number of planes, but not the actual sphere itself. And we can extrapolate to the space around it to fill in the gaps between the sphere and its polyhedron representation. But by definition, that gap is uncertain. We can model the gap if it's that important, but it generally isn't. The representation is good enough.