The argument conflates ontological states with physically distinguishable states, but quantum mechanics imposes fundamental limits on state distinguishability via the uncertainty principle.

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Conflate(the criticism being made in the statement): To mistakenly treat two different things as if they were the same thing.
Ontological: "Ontological" refers to questions about what actually exists or is real. It's concerned with the fundamental nature of being—asking "What kinds of things are there?" rather than "How do we know about them?" For example, an ontological question might be whether numbers, ideas, or God actually exist as real things, or if they're just human inventions.
Physically distinguishable states(what we can actually detect versus what exists in reality): Different conditions or configurations of a physical system that we can tell apart through measurement or observation.
Quantum mechanics(the scientific framework being discussed): The science of how the tiniest things in the universe (atoms, electrons, photons) behave—which turns out to work very differently than everyday objects.

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