He's right. There's no value in forum posting when it comes to link building. Forum posting can be good if you are building your subscribers list. Once you become credible on a particular forum, people will start to recognize and trust you. Put a link of your squeeze page where you offer a valuable free report, and you start building your list already.
I have 2 more accounts from other forums that has more than 1,000 posts, and building my subscribers list using forums really works for me.