I’ll go in english, cause otherwise I cant make myself clear. These are torque to yield bolts, which means, after initial torque done, these bolts will just elongate on futher tightening, and keeping same strength. To ensure equal load applied to bearing and wheel support housing.
Make no mistake in using existing bolts, otherwise you risk collecting your wheels from the other side the road.
Why there is a break at 30 degrees, this is to ensure correct tightness, but an metalurgic engineer might give some answers. But why bother, follow the instructions! Make a stop after first 30 degrees the continue to do the rest 15 degrees. You need tools! Do not loosen the bolts once you begin torquing!