I would disagree. The general principles for growth hacking always apply--far better than traditional marketing techniques do anyway. Growth hacking is, at its core, the art of building marketing into the product itself and then pulling in the initial customers/clients to kickstart that process.

But to go to your point PG has a funny line about cofounders. If you can't get a cofounder for your startup your idea will never blow up--because you couldn't even get one other person to agree to work on it with you for free