How to do good talks at conferences

The linked article complains about a content-free talk, which is of course useless, but some of the explanation could simply be that any useful information he has goes towards their competitive advantage, and sharing it actively hurts the company.

Most companies we talk about on HN are made up of mostly intellectual property - everything else is commodity (SaaS, PaaS, etc.) - so going up on stage and telling what are effectively your competitors how you succeeded could be seen as a Bad Idea.