“On the climb, I just had the numbers that I more or less push in a race,” he said. “Suddenly I was blocked. The numbers weren’t so special. Though for a while, 500 to 550 watts. As a cycling tourist, it may be unusually high, but for us as pros it is more or less normal if you want to win a race.”
It seems that Zwift’s typical algorithm for detecting cheaters, assumed De Gendt was racing at an incorrect weight and flagged his ride, however the Belgian is just strong.