The whole generational scheme that the author uses here just doesn't fit. Angstboy has already pointed out some examples from the 1980s that belie the neat categories.

However, as far as depicting the moment of destruction in possibly exploitative ways, I suggest Rosenbaum look up Philip Wylie's Tomorrow! from 1954 before he rethinks his assertion that such representations are only the province of later 'nuke porn.'

There's no cannibalism here, but I am haunted by Wylie's vivid description of the clicking sound a young woman makes as she runs in shock from the wreckage about a mile from the blast, on her exposed shin bones where her feet have been burned.

The book is ostensibly a testamony for the need to have a robust civil defense plan. Pretty shocking stuff.

It's an anime made in the '80s about the Hiroshima bombing and its aftermath. The original artist was a boy living in Hiroshima at the time of the bombing.

Came here to say this. Tomorrow is the granddaddy of nuke porn.