and thus do not interact with humans in a manner that provides communicable evidence
Could a future neuroscience in principle change this, or do you have a stronger notion of incommunicability?
It is possible the beings in question could have predicted such advances and accounted for them. But it seems some sufficiently advanced technology, whether institutional or neurological, could make the evidence "communicable". But perhaps by the time such technologies are available, there will be many more plausible excuses for spooky agents to hide behind. Such as AGIs.
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