Almost every job has to deal with the inconsistencies and constructs of society (including law, morality, history and creativity) while also navigating the decisions constrained by the physical world (perception, physics). This is more than any machine, ever, has managed. I'm just thinking about food service, crossing guard and roofing, which isn't even a statistical blip.
What is true is more like "~80% of many jobs is routine enough to (theoretically) be handled by a machine."
This phenomenon is obvious with e.g. grocery store checkout machines. For every 5-10 machines, there needs to be one person to confirm I'm old enough to buy alcohol, or assure the machine I'm not stealing when I bag my onions in a way it doesn't recognize.
