Thing is, I don’t really see any defensive skills like Peltasta’s Guardian, Buckling, High Guard, etc.
Rodelero has…slithering…maybe? Although I’ll admit I couldn’t test that one properly.
Shield Bash, Shoving, Push, Montano, Targe Smash and High Kick have debuffs, so that’s why I think it’s mainly a debuffing class that shines in PvP if used properly (it’s hard to get in range).
Now, you could say a tank does its job better by picking up this class. That doesn’t mean that the class itself is a particularly tanky one, since it can fit in a lot of builds.