Strangely the author complains about bad comparisons but spends little time on how to make a good comparison. Here's a take on how to properly compare a company's financial flows to a country's (GDP):
https://www.forbes.com/sites/timworstall/2011/06/28/gdp-for-...
tl;dl - the closest approximation to GDP that you can pull from a public company's financial statements is gdp = profit + wages paid.