Your link references a single study of 18 research participants who were male, exercised exactly once or twice per week, and were between the ages of 18 and 40.

It's an interesting result, but it hardly "refutes" the hundreds of larger studies that show the opposite result.

The most likely thing is that this paper is just a complete anomaly though. It'll be interesting to see if anyone else ever replicates this result, or does so in a more representative participant population.