This really isn't so hard. They have played 12 games against the Top 50, going 5-7. WV just slipped to 52. If they were 2 spots higher, UConn would have played 13 games vs. the Top 50, going 6-7. UNC doesn't have 6 Top 50 wins. Only 13 out of the Top 20 RPI teams have 6 Top 50 wins. They have only played 3 teams whose RPI is > 200. SU has played 6.
Their RPI is not a joke, as much as you would like it to be.
No it isn't hard. Let's complete the picture. First, do we ignore losses outside of the top 50? Cuz they've lost to 67, 93, 139 and 149. Yikes. The five top 50 wins you reference are ND, SHU, USF, FSU and Harvard. As DC would say, whoopty damn doo. They're 17-12 and 7-10 in the conference. That sucks.