I think he’s making an argument that you can make games with much less code than we do now, not a serious argument that we should only make games that fit on a business card.
Maybe comparing business card games to AAA is a bad comparison, but comparing 'Return of the Obra Dinn' with 'LA Noire' might be more apt.
With dwarf fortress coming in at 381,764 I feel like it delivers a much higher amount of value/line.