Ah, you were referring to the side pods.
Sorry, ignore my previous post.
The 'side pod' wing with the winglet. I would guess that the 3rd wing changes the Center of Gravity with more down force in the center of the car which would improve turn in, reduce understeer and help with front tire temperatures.
Daniel set almost the same time with yellow tires vs his previous red tire run in Q3. The car was planted.