Hypothesis for a calculation of M600: 2/27 x 1.2 x 1.2 x 50 [supposed area] x 1000 [cubed wind speed] x (10.6)² [(L/D ratio)²] = roughly 600 kW before cosine loss.
L/D ratio wing alone = 10.6; optimized L/D ratio with turbines = 7.0666666; wing area estimated at 50 m². With a lift coefficient CL of 1.2, wing area x CL = 60; so wing area x CD should be 5.66, leading to a drag coefficient of 0.1132. The thrust (drag) of the turbines should add 50% of 5.66, so 2.83. The thrust coefficient of the turbines is 2.83/33 = 0.0857575.
Verification: 33 x 1.2/2 x 70.666666 x70.666666 x 70.666666 x 0.0857575 = roughly 600 kW.
It looks that the turbines are (10 times too) large due to E-VTOL requirement, then the thrust coefficient is lower during generation. And a relatively important diameter of the turbines leads to possible relatively slow and heavy generators aloft: these large turbines are not optimized for the generation phase, due to E-VTOL requirement.
IMHO Makani M600 looks to be by far the most advanced and efficient crosswind AWES.