If self-delusion has been operating, then the person would not be aware of it, and hence feel truthful, not deceitful.
Naturally, any hidden defenses would be exposed only gradually. This happens to everyone in some aspect of their lifetime evolution. Release from delusions is tedious and troubling, but is a huge relief in the long run. It involves delicate, patient diplomacy to help a person become free of delusions. In matters of science, sharing of evidence and reason has to work skillfully with, not against, delusion. So, it's progress, if delusion is involved, to focus on a key detail, like the steam dryness. Also, the Rossi device may still be producing various anomalies, even if the power output in fact is less than hoped recently.
