I probably saw that same article (I get their downloads newsletter, which typically includes a couple of links to "news" items as well).
And I agree with what I think they mean by the "second opinion", although they sure did word that one badly. Going way, WAY back to our first office computer, an XT, I was taught back then to always run scans from another OS, in case your own was infected, and it was preferable to also do another scan afterwards with a different scanner.
Years later, one of my excellent local shops taught me a new one -- they recommended always running any scan at least twice, back to back, because sometimes it would catch something on the second pass that it missed the first time.
But I'll definitely second the motion for avast as the first-choice scanner. I first got it (32, then) maybe a year and a half ago, on the recommendation of friends from one of my support groups. Aside from the advantage of being freeware, they said that on quite a few occasions it had caught things for them that had slipped past Norton.