Let me reaffirm that Defkalion has every right to demand NDAs from their visitors. There is nothing unethical or unusual about keeping a product like this under wraps.
However, they cannot expect people to fully accept the claims as long as they stick to this policy. They have a binary choice: secrecy or credibility. They cannot have both. They put on a demonstration. That is suggestive. It is helpful. But it is not proof. It is unreasonable for Axil Axil to say that other researchers should accept these claims at face value. Defkalion does not get a free pass. They must be held to the same standards everyone else is held to. If they want people to believe their claims, they must reveal the data and the independent tests supporting it. It is unreasonable to say that people reject the claims because they don't want to believe in transmutations. I have never heard of anyone in this field opposed to transmutations. There is a lot of evidence for them.
