Redirecting a portion of the airflow in proximity to the rear wing would't alter the amount of air passing over the rear wing. I think they're flow straighteners, which also produce some downforce in their own right. There was a comment sourced from Merc, in one of the other threads, where they said they found that the T-wing performed the same function as a shark fin. What could they mean by this?
Well, the shark fin operates as a big flow straightener or conditioner. And no I'm not talking about hair products. Although McLaren just taped a curler in front of their rear tire...
https://twitter.com/ScarbsTech/status/8 ... 9752849408
I think Merc took the shark wing concept, rotated it 90°, and gave it a wing profile. Presto, flow conditioning plus some extra downforce. They're having their cake and eating it, too.