Requirements for a chinese business visa in the phils

am applying for a chinese business visa since i will be attending a sponsored event in shanghai. i cannot
secure an invitation from an authorized unit from china since the event organizer is a private organization. went to the chinese embassy and i was told to secure this one. the info, however, in the website states that we need a "Invitation Letter of Authorized Chinese Unit, or a Confirmation Letter of Invitation issued by an Authorized Chinese Unit, or an Invitation Letter issued by the Chinese companies, corporations and institutions other than above-mentioned Authorized Chinese Unit. "Reading thru this, it seems the invitation from the company other than by an authorized chinese unit is enough?