Assuming this is in reference to Epstein's testimony to the Grand Jury, that was never classified. Those records were sealed under State (Florida) Law. And were also unsealed in July by a special (also State) law. But, to answer the question you are asking "could the President unseal such documents?" No, the President could not. Especially considering that the documents were sealed by State Law, over which the President has zero say. The President could apply political pressure and ask the State nicely to do it. But, the President cannot unilaterally override State Law.