"go nuclear" is usually a sign of someone messing up badly and trying to cover their tracks.Eevry time I hear this phrase "go nuclear" I am reminded of a meeting I went to with my partner about 20 years ago. We were in a serious legal dispute with some guys who were trying to take control of the shares of our company. We were in this meeting with a solicitor at Eversheds, a serious big hitter, and were talking about something like if they decided to withdraw cash without our consent or similar.
Anyway my partner confidently stated "If they do that we'll throw the book at them" and this solictor just casually but pointedly asked "What book?". She had no response.
I think this "go nuclear" phrase is the same: baseless bluster. There is no "nuclear".
The pathetic incompetence to even correctly list the charges from the PL says a lot about their case.