I will do the lawyer Pak Fa :D
Yes, to me seems surprised fan.
But I can imagine some reasons...
Maybe the Russians did not want to start sacrificing aerodynamic performance for sake of stealth.
There are some photographs of the YF-23 (which they said that it is more stealth than the YF-22) showing very intense fans.
You may use radiation-absorbing materials (RAM?) fans.
As they told the children before, probably will change the shape of airway S-shaped aircraft production.