Here is a video of a system based on Fig. 1a or 5.
As the kite on the video is 2 m² and the wind speed is 5 m/s, assuming a L/D ratio of 4, a rough calculation in pumping (yo-yo) mode would give a mechanical power of about 350 W during reel-out phase, so about 175 W in average, and less in electrical power, but likely more than the given value of 100 W. However said value of 100 W is higher than I expected. And as already mentioned this cannot face all wind directions.