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If one adopts a pragmaticist theory of truth, then as the sentence has no empirical consequences, neither would it have any truth-value, neither true nor false.
If one adopts an intuitionist theory of truth, then "not false" is not always the same as "true", and may in some cases also be false.
If it were true, it would be false and if it were false, it would be true.
If it was true, it'd be true.