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Maybe it time-traveled back from the future to save us from deadly attack by an alien probe, to give us a chance to get things right this time.

Or maybe it has had a wound or a disease that caused a frequency shift in the sound? (just a quick speculation)

The article mentions that the whale may be deaf.

There was that radio emission that was meant to contact aliens or some such.

Perhaps the aliens thought that some stupid deaf hunam sent it.