No one really knows if he actually wrote this or not, but it is certainly not the manifesto that was found on him. His manifesto was written by hand and many lines in that hand written manifesto that have been revealed to the public are not present in the one floating around online.

this isnt actually from his manifesto this is from his goodreads review of "industrial society and its future" (unabombers manifesto). its actually originally from a reddit comment that he thought was interesting

www.reddit.com/r/climate/co...

this is the full comment if ur interested

thats cool as hell n ur a legend for doing that