The author just got bored and lost himself in this. You could tell.
You could have just had the robot have a crafting mechanics installed. Take iron ore or stuff and make weapons and shit. Like Jesus.
@LordFifthIsLife Definitely. Martial arts like Taekwondo, Judo, Karate, etc., can give you the foundation but you need all rounded training to be efficient as a fighter. For this era anyway.