If DDRS (the ROOT of the heavy rear tyre wear) can be blocked off, why couldnt they do that as soon as they realised it was more hinderance than help?
How are you qualified to make that statement? In fact, you've recently been making a lot of design assumptions. On you go: show your data. Why is their double DRS worsening rear tyre wear (typically controlled by rear down force and suspension geometry)? And why is a 60% scale model in a wind tunnel superior to a 50%?