I don't think the entry is stating the stat adjustments, it reads in part under the Empty Vessels As Characters heading, "Humans born and raised on Sarlona to become the Inspired recieve special training and education. and they are remarkable individuals in their own right. Empty vessels generally have the following ability scores before racial adjustments: Str 8, Dex 12, Con 10, Int 13, Wis 14, Cha 15."
I think what this means is, unlike other "(X race) as characters" entries that lists racial adjustments that factor into what it would be like to make a customized member of that race, Empty Vessels themselves are so bred and controlled in how they are developed that Those specific stats are what nearly every Empty Vessel individual would have starting out.
I don't understand why the wording says "Humans" at first and then "...before racial adjustments" later as if the Empty Vessel could be something other than Human, perhaps this allows for human variants with stat mods that I can't think of right now. I do know once possessed by a Quori their mental stats change, it could mean something as simple at this, but then you are no longer looking at an Empty Vessel as a PC.
Also, note that an Empty Vessel is a +1 LA.
The fluff of the Empty Vessel indicates a race of individuals who live their lives for the day that maybe they will be possessed and their will subverted when a Quori spirit takes over their body. No doubt there can be exceptions of those who rebel and flee this fate, no doubt leading to an adventuring lifestyle and making use of the other racial bonuses, but there is nothing I see in the text that suggests they get the stat adjustments you described.