assuming all of the gold revaluation gains get credited to the Treasury's general account to retire government debt (e.g. by re-purchasing US Treasury bonds from the market) - that would cover a mere ≈3% of outstanding US government debt

gold revaluation proceeds are not necessarily used to cover sovereign debt

central banks of Italy, Germany, Lebanon, South Africa & Curaçao and Sint Maarten reevaluated gold in the past, with some using the proceeds to finance the government, while others the central bank