Back then, that was pretty good advice. IE was so insecure your entire system was at risk if you were exposed to the wrong content. Google made their browser quite secure and fast, which negates some of the reasons why people used ad blockers. There are other reasons people might use them, but these days you're much, much safer on Chrome than you ever were on IE.
Maybe the attacks were less sophisticated back then. I've seen so many windows computers completely owned by people using chrome to stream tv shows or perhaps visiting the wrong site while looking for discounts on shopping.
