That one was new to me too (and I've had kook-watching as a hobby for many, many years).
It appears there is a pretty new fringe conspiracy theory (fringe even among the conspiracy theory fringe) that nuclear weapons are a hoax. In a very quick search, I found this (self-published) book from 2017, which could be the point of origin, although it would require more digging to be certain:
Death Object: Exploding the Nuclear Weapons Hoax
Its thesis simply appears to be that the existence of nuclear weapons is a hoax, no atomic bombs were dropped on Japan in 1945, and all the governments and all the scientists in the world since then are part of a grand conspiracy to perpetuate the lie such things exist.
"Professor of Applied Mathematics and Statistics" at some unnamed institution, appears to have little or no online existence except as the author of this one book. (There is someone with the same name who published some papers about gallium arsenide semiconductors in the 1990s, but it's impossible to tell whether that's the same person.)
The book 'War Against G-o-y-i_m' by Chris Caskie offers a lot of sources to backup the claim of nukes being an illusion, such as:
Hiroshima revisited by Michael Palmer
Death Object: Exploding The Nuclear Weapons Hoax by Akio Nakatani
>Judy Wood
Out of this group, she appears to have the most relevant qualifications, as Amazon says this about her:
>Dr. Judy D. Wood is a former professor of mechanical engineering with research interests in experimental stress analysis, structural mechanics, optical methods, deformation analysis, and the materials characterization of biomaterials and composite materials.
It appears she taught at Clemson University. I'll definitely have to analyze her claims.
>Nick Kollerstrom
Kollerstrom's PhD is in history of science, and he has a BA in natural sciences (it appears to do with plant life). I'm not sure what any of his qualifications have to do with the Holocaust, an event historians and my great Grandfather very much understand happened.
>Akio Nakatani
This lad's qualifications have nothing to do with nuclear weapons. The About the Author section on Amazon for his book Death Object: Exploding The Nuclear Weapons Hoax says this:
>"Akio Nakatani is a Professor of Applied Mathematics and Statistics. His research interests include Stochastic Systems, Parameter Estimation, Stochastic Optimization, Monte Carlo Methods and Simulation, Neural Networks, Statistical Pattern Recognition, Statistical Image Analysis, Time Series, Graphical Models, Nonparametric Bayes and Bayesian Hierarchical Models."
I'm not quite sure why one would doubt the existence of nuclear weapons, and I read an old EIL post about the alleged hoax.
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I wouldn't value the words of mechanical engineer over the average person when referring to information about the inner workings of the endoplasmic reticulum of a human cell.
EMP, because atomic bombs are probably a hoax.
https://www.amazon.com/Death-Object-Exploding-Nuclear-Weapons/dp/1545516839