Looks like they're going for a mini canard/splitter side-plate effect (see below), which theoretically diverts air away from the wheel wells, improving downforce and drag. But the TRD aero turbulators seem too small and only attach using double-sided tape, which tells me it's not having much impact with oncoming air (but I'm no engineer either, just speculating).
Like you, I like having TRD parts on my car, but I try to stick with the functional pieces or ones that I can feel. I just don't see this as one of them; they seem more like a aesthetic piece. And in my opinion, not very aesthetically pleasing. They look like something out of the ricer section from AutoZone
