"the private sector has no interest in furthering public values that true multi-stakeholderism would promote, ahead of
its own power and profits, which could be threatened by further democratizing governance processes."
They are damning the same private sector motivations that produced the most democratizing technologies the world has ever known: Internet search, email, social network services, e-commerce platforms,
etc.
Here's a post I did on that debate. Gives you a sense for politics in the multi-stakeholder model.