Forbes is using the 'FuckAdblock' thing... so yes, it doesn't work when you're using Adblock. But if you install the FuckFuckAdblock extension, you should be able to see the article. Here's a link to the extension: https://chrome.google.com/webstore/detail/fuckfuckadblock/hb...
Hah :) So, as it happens, I was just last night talking to a guy who was basically attempting to make a 'FuckFuckFuckAdblock' -- a js solution to detecting the presence of FuckFuckAdblock extension. (I'm not sure how far he got, I'll try getting in touch with him soon to see how that's going. And, the guy was looking into creating this just for kicks, he's not in the ads industry). Anyway, so naturally we might very well soon be seeing a FuckFuckFuckFuckAdblock extension (or F^4, if you would).
The logical conclusion of all this is probably a FuckEmAll extension that uses an ADsafe-style subset of HTML/CSS/JS, automatically transforms anything to it, performs checks that focuses on attackers' goals rather than tactics, and thereby prevents "all types of fuckry." [1]
It's a test they're running so not all users with ad blockers will see it. You can get around it by setting the forbes_ab cookie to false before clicking continue.