I dont think there's any way to know if this is real for sure. The paper however has a lot of details on the birth of bitcoin, lending some credibility to author's claim.
“...Hal, if you're up there mate, I hope you're doing well, you should know this excerpt is really called "Bitcoin, me, and Hal Finney". God speed. Save me a seat at the table ...”
I stopped reading about 1/3 through. The bit about Moore's law in the beginning is a small blocker talking point. Then he said PoW wont be necessary to sustain bitcoin. 100% disinfo.