that's baseless..one line of baani...and baani it is, but still
dashmesh pita guru gobind singh ji made kesh a kakaar did he not?
so by choosing to say there is no religious facet for kesh in sikhism, then forget kanga, forget kachera, forget kara, forget kirpaan...forget dastaar, forget paath...you can question anything, and as we learned from good ole grewal, you can choose baani to say anything you want...
kesh is kakaar.. one line of baani won't change that