Is it going too far to suggest that the exhausts appear to be blowing onto the top of the lower rear wing element?
That is going off TerraNova19's link, the angle of the bodywork opening, and the fact that from the angle the shot is taken- ie, looking down on the exhausts through the top of the lower rear wing element, the pipe appears perfectly circular.
Let the criticisms come flooding in!
You are not mistaken - Blowing the rear wing - top or bottom...
I forget where I read it but it (Scarbs most likely) that Williams were testing that solution out with last year's FW33 during December & we would eventually see it on the FW34.