Looking at the sub micro Joules per second energy release, I would not exclude the same effects as suggested even with iron plating. I think we can conclude that additional tests are required to exclude conventional effects. I rest my case for now.
Conventional effects haven't been ruled out even by the inventors, yet, but they have been at this for far longer than it would seem, at the Srinivasan memorial conference they were already more than two years into this, and they have tested them for months, filled a patent application, and even tested several other models (100 at that moment).
If you review their January presentation, they could not achieve the same effect with a verified commercial radiation source that should have been able to ionize the gas, so, the ionizing effect, from a radiation that was observed and verified already by Rout, Srinivasan et al in the early 1990s, is there, is quite strong, and no one still knows of what kind this radiation is.