*dubiously regards WonderWAAAGH after realizing that his signature touting he is "an angelic creature free of sin" is attached to a 40K orc who is (based on name) about to declare orc holy war on some poor unsuspecting guardsman"
Actually, I rather think that Aaron Allston (the individual responsible for the Stealth X) took the approach that any civilization that could build a space station the size of planet, swords that could wrangle plasma into a usable melee weapon, make an object invisible to the naked human eye and produce faster than light travel could figure out how to make heat signatures disappear - he didn't need to explain it any more than he needed to define how a hyperdrive works.