"Demonstration" must be phenomenal, by definition. If it is noumenal it would have to be intuited, not demonstrated. Perhaps this is where you're getting confused. The MDC is utterly uninterested in "the actual process"; they are interested solely in what can be phenomenally demonstrated.1... The demonstration is not phenomenal, being in itself noumenal, and its effects phenomenal.
The actual process of the non-phenomenal communication is beyond the level or range of phenomenal perception.
2... I agree, proof of a noumenal event lies in the realization itself, beyond phenomenal perception, which I have emphasized all along.
Intuitive certainty is not "proof" in any sense. It is what it is--"intuitive certainty." Proof is what is demonstrated ("look, here, I will prove it to you") and therefore it is a matter of phenomena, not noumena. If you are convinced by intuition that you are receiving "noumenal" communication from your friend, that's nice for you, but is not "proof" either for you or--a fortiori--for anyone else.
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