Source on that? Hobbiest aerodynamics nerd and big into F1 (and did a lot of liquid system design engineering in a previous job). Genuinely curious!
My gut feel is that a half kilo of unsprung weight (those ridiculous wheels), tighter fenders, or a bit of tail teardropping would go so much further than anything door-handle-wise. It's certainly helping promote flow attachment, but you've got poor flow rates there because of the wing mirrors anyway