Guess I spend to much time writing computerese... all these statements make perfect sense to me and it appears he covers almost all his bases (all viable permutations)
Known Knowns - things that we know... and we know that we know them.
Known Unknowns - things that we don't know... and we know we don't know them.
Unknown Unknowns - things that we don't know... and we don't know that we don't know them.
the only one he missed :
Unknown Knowns - things we don't know that we know... but we know them.
All the above situations are possible.
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