See also on http://www.kitekraft.de/#4_System_Development with still higher values (rotor area/wing area) as mentioned previously, perhaps because of the high wing lift allowing larger rotors aloft:
“Kite
Wing Span: 4 m
Wing Area: 1 m²
Weight: 30 kg
Rotor Diameter: 0.4 m
Number of Rotors: 8
Total Rotor Area: 1 m²”