Detrimental, being a higher pressure at the leading edge of the concave of the trailing edge?
Too me the concave would create a low pressure pocket infront of those turning strakes, possibly working together to energise the flow through to the front of the floor.
Though i do agree this is an area where Torro Rossa need to develop, the strakes were abandoned for the scoops by the leading teams quite some time ago and could possibly be where they are hoping to achieve their gains come Spain.