It starts with "Writing code in {programming language X} can be 98% more efficient than {programming language Y}" and then calculates from that statement. Where

It starts with "Writing code in {programming language X} can be 98% more efficient than {programming language Y}" and then calculates from that statement. Where can we find the source of the first statement? "If you submit a video or pdf, please warn us by appending [video] or [pdf] to the title." https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/newsguidelines.html