It says "Against Civilization" is "spreading versions of his message", meaning Kaczynski. But "Against Civilization" was written by John Zerzan, and Zerzan was saying these things before "Industrial Society and Its Future" was published.

In fact, while Kaczynski was more militant, Zerzan is more radical, he sees the problems not starting with industrial capitalism, but with the original agricultural slave empires of the Middle East.

Defining primitivism by Kaczynski is like defining Zionism by Baruch Goldstein, or the anti-abortion cause by Scott Roeder or so forth. Or US patriotism by the torture in Abu Ghraib.