Looks like they're testing two versions SPLEF (SidePod Leading Edge Flip-ups) around the sidepod inlet at the same time. By the way I strongly doubt the longitudinal cuts at front half of the bargeboard footplate are used to counter incoming flow from the outside to the inner surface of the bargeboard, in order not to let air rush in through the gap between the footplate and ground. The bargeboards create strong suction when placed too close to the ground, generating upwash right under the monocoque, which is not ideal. As a result, if you could generate some outwash around this area, creating a strong boundary condition to counter the incoming flow, it will probably form an effective seal and thus is an effective solution. Working on Formula SAE diffusers and trying to counter act inwash generated by parts in front of the rear wheel. The inwash hits the tyre and create large tyre squirt areas going straight into the diffuser. Tried solutions similar to this and shows effective seal, though no improvement in numbers (not optimized yet).