I think his comment was facetious. I think the clue is "no true scotsman," which is a type of fallacy. I think the point is that it's assumed to be better because of the use of "modern," and that it's only valuable if it's rewritten in something modern. Perhaps it's a joke about how old code is actually fine, and that people who get excited about the cutting-edge technology could chill a little bit. Maybe it's just a mockery of the previous arguments.