The argument conflates model underdetermination with ontological indeterminacy: the existence of indistinguishable trajectories in model space does not entail that the actual system lacks a determinate state.

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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.
determinate state(The argument claims that even if our models are unclear, the actual system still has a definite reality underneath): A condition where something has definite, specific properties and characteristics rather than being vague or indefinite.
indeterminacy(Decision-making under uncertainty in political and legal contexts): Uncertainty or lack of definite knowledge afflicting one or more conditions of a decision procedure, making it impossible to fully specify choices and their outcomes

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