Wanna hear my wild ass guess? Someone reused a cone/voicecoil/spider assembly (the latter looking a bit torn up in one of the pics), then refoamed it.
Would explain a worn/sloppy suspension (low Fs). I don't really think the DATS-3 is the problem; the high Re just --appears-- to be function of their algorithm that made some assumptions about how low (and how high a Q) the resonance of a driver would be. The curve shapes and 6 ohm minima between 100-200 Hz isn't crazy ... even cone resonance wiggles look kinda right. I hope I'm wrong about the driver.