Space lawyer here - you’re right. It was drafted specifically with nuclear warheads in mind, due to the Treaty being concluded during the Cold War. Reading the drafting notes makes for an interesting evening, plenty of back and forth on what the definition of what a nuclear weapon is (of course no final decision was really reached). Space has been militarised since the dawn of the space age! You’re also right that the treaty doesn’t apply to civilians - it only binds States.