Hardened steel Nozzle

Yes, if you follow the official hexagon / Lulubot way of torquing it. If you do it the e3d way as I described it in my Howto, you don’t have this risk and even don’t need a torque wrench: Howto: Change Hexagon hotend nozzle
In my oppinion, there is no logic reason why Hexagon recommends that dangerous way of mounting!