Well because we are talking about it from another perspective.
There is only 1 serious threat for the Gold Medal and that is Mima Ito.
She is the only player that can consistently beat Chinese players.
All the other women aren't that big of a threat.
So if you want to select players with the biggest chance of a medal, you would have to select who can beat Ito.
The matches between Chinese women themselves don't count at the Olympics , since you only meet non chinese now. It's not like foreigners won those Olympic,world and continental titles.