Postmodernism has a bit of relevance for hard sciences, because relativity is known to be counterintuitive, and as a consequence theories will have absolutist bias. Consider Roger Penrose's Andromeda argument, where he tries to reason about synchronism in the context of special theory of relativity, but ends up assuming Galilean absolute synchronism, because Lorentz synchronism is counterintuitive.

Bad interpretations of data or theories are always a possibility, however that's only relevant to the interpretation.

Unless the data itself is fabricated, i.e. unscientific, the hard sciences are "hard" because they don't suffer from these flaws of interpretation (as much). There of course issues with observability, replicability, however these are issues that can be dealt largely without invoking any societal biases, aka through the scientific method.

Rejecting the scientific method completely because humans are involved at any step, is a form of absurd-ism, yes, we are not perfect, but our methods are a lot better than a) nothing b) your choice to reject hard science because it doesn't match your personal belief (hard bias).