Unfortunately, he was also inflexible, difficult, and a bit of a pipe dreamer with no business sense. (That is why he died penniless in NY in 1943).
I am no expert here, but in the second half of Tesla's life he conducted experiments and theorized about the feasibility of various science fiction-line devices, such as a "Death Ray" that could obliterate an entire city.
My guess is that whatever this dude is talking about falls under one of these science fiction fantasies spun by Tesla.
There are some who believe one of Tesla's "death ray" experiments caused the Tunguska explosion! The morning of the Tunguska explosion he was playing around with it - he indeed managed turn an owl into charcoal that flew in front of the beam.