Yes, you’re correct. I left out all of those details to try to simplify the explanation as much as possible. The reality is that the pixels we were drawing got narrower as our display hardware got better. In this VGA text mode the width of the pixels is 20⁄27ths of the line height. But you obviously don’t want to scale the 720 pixels of width down to display in just 533⅓ LCD pixels, so instead you have to scale the height up. It was just easier to start by saying that the height of the CRT’s pixels was 27⁄20ths of their width instead. :)