If you read the blog, you'd see that the system he's suggesting is somewhat more robust than a spreadsheet. His example at the end is the Google Forms builder,

If you read the blog, you'd see that the system he's suggesting is somewhat more robust than a spreadsheet. His example at the end is the Google Forms builder, which at least does a modicum of input validation, unlike your typical direct-entry spreadsheet. And the point is not to completely dismiss the idea with a glib soundbite like that, but to actually take seriously building tools like spreadsheets that allow non-technical users to build data-driven systems.