It seems to me like a simple "dirty air generator" producing some turbulent flow and vortices. In principle what was done before with a lot of edges and corners, the drag penalty should be similar.
They’re doing many laps, but not proper long runs. They’ve been doing fast laps with DRS, then cool down laps, repeat.
Bit unexpected to see Aston that high, the midfield has more to come it seems but wouldn't mind a good weekend for AM