1, Bragg has zero standing to charge Trump with federal election violations. And even if he did, the accountable federal entity - The FEC - already ruled there was no there there.
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It's not clear under the statute whether the "crime" has to be a state crime or one that the state prosecutors have jurisdiction over. If you falsify a document in NY in order to commit a murder in New Jersey, it might be felony falsification of records, even though NJ - and not NY - has jurisdiction over the crime that the falsification was in furtherance of. A more realistic example might be if someone falsifies business records in New York in order to commit securities fraud - something that seems to be exactly in the wheelhouse of what the statute is trying to get at, even though the crime is a federal one.

And the FEC's decision isn't binding on prosecutors - they're the civil enforcement arm, and can impose civil penalties, but even if the FEC declined to initiate a civil enforcement action the DOJ could bring someone up on charges if they chose.

It's certainly a fruitful line of defense for Trump to assert. But it's not a 30 second ruling.