Shirley this is wrong
"They found that the regions near the equator reflect radar waves more readily than its poles, and the reflection patterns are best explained by the existence of these icy blades."
If the surface was smooth you would get more reflection at the equator than the poles.
If the surface is covered in penitentes to almost 15 metres or 50 feet in height, with a spacing of 7.5 metres there would be more reflections near the poles than the equator. All those surfaces perpendicular to the radar beam and all.