Honestly found this book insulting to its readers. The author loves sentence fragments and will make a point in a single sentence then pad it with half a dozen fragments from a batch of their favorite phrases. I don't think you need to work very hard to find a reasonably plausible scenario for an actual nuclear exchange, but the scenario in this book appears to be "the unnamed leader of North Korea decided to launch a decapitation strike against the USA for funsies". At one point the author has a sentence along the lines of "We don't know why NK launched this attack" -- MOTHERFUCKER YOU WROTE THE BOOK! YOU PUT THE IDEA IN THEIR HEAD!
There's random math errors that probably aren't important but are certainly confusing. There's a lot of arbitrary twists and turns to ensure the worst case outcome. Also, there's a lot of talk about EMP …