The problem being described is that, in the early 00's, there was no easy way to make column layouts with CSS due to IE6 and CSS's own lack of good column handling rules, other than float: left and (later) display: inline-block. This led to most people in web development to produce their page layouts by stacking tables within tables within tables because the end result would visually work properly in every browser. This was, however, an awful way to produce semantic content not to mention the inherit accessibility issues.
Thankfully, by 2006, nearly everyone had already been exposed to the likes of CSS Zen Garden and learned how to workaround with CSS issues to make layout with block elements instead of tables within tables.