I don't see how mech couldn't get them off, maybe he put it too tight with his impact wrench (idiots) but just take a breaker bar and a pipe and it comes off.

I don't think he tightened to 120 ft-lbf which is still not a lot. If he can't get it off it is in the 300's or more. With pipe you can easily develop 1000 ft-lb but you will break sockets and such

I should take a picture of the mangled MB lug wrench I have from my CLK because of such idiots with their impact guns...