I'm not sure why the author takes such umbrage at A16Z promoting its own portfolio companies. It is their blog after all.
I have tremendous respect for a16z, a firm that helped pioneer the practice of working with and nurturing founders rather than forcing them out pre-IPO or minmaxing term sheets.
more a call to be more transparent and less submarine: but to do so under the guise of being helpful and impartial is just plain silly.