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Am I going mad or aren't shimano using some kind of laminate carbon thing laced onto an alloy rim (like the cosmics), whereas most people would assume a carbon wheel is made entirely of carbon, no (light or not)?

^he's is referring to the two diff DA wheels; the SL is a normal scandium extruded rim whilst the CL is a rim that is extruded and then machined/milled down to dangerous levels and then has carbon bonded to it to add back the stiffness. Shimano lists the rim weight as 380g and it's exactly the same rim as the RS80 wheels.
Shimano do the same process on the 50mm clincher CL rims too and the RS80 version of those arrives next month.