Anti seize on spark plugs in aluminum heads?

It sounds like NGK is saying, hey dummies who apply anti-seize and torque plugs, it acts as a lubricant causing you to over tighten and stretch the threads within the head, ruining them.

Thread breakage appears to be referring to the cylinder head, as they state you would need to remove the head to fix.

Metal shell stretch changes the heat range of the spark plug, what does this mean exactly?