The article is less kooky than just pathetically ignorant. It starts off with a rant about government interference with land use, and then rather discordantly seques into monetary policy. It seems to blame the collapse of Bretton Woods on land use restrictions, when just about everyone else on the planet thinks it was more about the dollar being overvalued because of LBJ induced guns and butter inflation. But yes the assumption is that about 100% of the GNP comes from mining and agriculture, and that is the only source of wealth to repay the debt. That is also really, really, quite bizarre.
It might cheer you up to know the government debt is close to a post WW II historic low as a percentage of GNP (maybe not if GNP is cut back to only include agriculture and mining). Ain't that grand?