If there is no fact of the matter about an experience occurring prior to any form of noticing or discriminative response, then acquaintance cannot be the relation that explains the gap between having and noticing experience.

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Fact of the matter(whether there is a definitive fact determining correct interpretation): An objective truth that exists independently—something that is actually the case, rather than a matter of opinion or interpretation.
acquaintance(Russell's epistemology of singular reference): Russell's form of demonstrative identification, in which a subject is directly presented with an object (typically sense data) rather than an extra-mental individual
discriminative response(philosophy of mind - how we process experiences): The ability to notice differences between things or to react to specific details in your experience—like recognizing that one color is different from another.
relation that explains(metaphysics and epistemology): A connection between two things that helps us understand how one causes or creates the other.

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