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If the hum is inaudible to humans, but can be detected in the recordings, all that is necessary to create a plausible fake recording is to use a device that is incapable of capturing the hum, or severely compresses the hum so much that the hum is not distinguishable. This may not provide a means of proving the recording is authentic, but it prevents the defense from demonstrating that it was fabricated.

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Hacking the system requires reproducing an identical "hum" and not necessarily compressing it. It seems difficult but I wonder if it is impossible for someone with a synthesizer and access to their database.

You don't need their database, you just need to record some background noise (assuming that you can replace the hum in your recording with another one).

interested in the false positive (hum is present) in which case the hum you need to "replace" something with needs to have signal correlations that match the ones in the database they've built up.

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