Ah! The good old MOM. The wonder woman of anti-seize.
Yes, it is used in very high temperature areas on jet engine threads to keep them from seizing.
The catch is, all of the parts used in the hot sections of jet engines are corrosion resistant materials like 17-4ph, Inconel, austenitic and martensitic stainless and other more exotic materials like waspaloy, hastelloy and stellite.
MOM (Milk of Magnesia) is a water based product and using it on plain carbon steel can cause corrosion (rust). About the last thing I would want to use on the screw threads on my muzzleloaders is something that could cause the threads to rust.