Actually the topic of the thread is basically what can we learn from the screenshot, so he's basically just speculating on something he noticed. Also keep in mind the game is pre-alpha, it could just be a placeholder at this point.
Ah i see that now - it does relate to the SS.
That being said, I bet "weaponry" is just the analog of "space weapons" and "space defenses" in GC2 which then in the tech tree you could study lasers, missiles, or projectiles, and on the defense side the specific techs to counter each. My guess is after weaponry that you then have the option to study "sword", "spear", "bow", etc. Sorry for the misunderstanding Climber