I mean, I did download the spreadsheets and (skim) read the book after reading the parent article. TL;DR is that the spreadsheets are solid and unsurprising, though his interpretation of said spreadsheets seem to be the part that makes me ask "hmmm, I'm not sure if that follows from the evidence."
Full breakdown, with direct links to the spreadsheets: https://news.ycombinator.com/item?id=30368620