Even first year science students know that the moment your data cannot be checked, regardless of the reason, it is not the scientific method and therefore cannot be relied upon whatsoever.
The fact our govts rely on it is a travesty. Exposing politician's low IQ's.
Mann's claiming the data would be miss used is exactly what he did himself. This is why he hides it. He fears exposure and never states how they would miss use it as this is the only reason.