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when I say that something is unknown I am making a statement about my own ignorance, not a statement about the physical world.

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I'm not sure what your point is, but it made me think of something amusing:

You exist in the physical world. You body is in meatspace, and your mind is in the ever fluctuating electrodynamic field. Both of these can be modeled by physics equations to a very high precision.

Therefore when you say you believe you do not know something, even in reference to your own perception of your self-knowledge, you are nonetheless making a statement about the physical world.

Sorry if this sounds pedantic. :P

A statement like "I don't know the momentum of this particle" is likely encoded somehow in the state of specific neurons in my brain (though some philosophers would disagree), but it's not a claim about physical reality inside my head so long as we don't know how it works nor which neurons we would have to examine to verify it.

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