The " technology-deficient planet" referred to a world in the Legends continuity where the Human or Near-Human population possessed only rudimentary technology. Their technological capabilities were limited to things like horses, projectile weapons that fired slugs (slugthrowers), and metal swords; they lacked any form of sophisticated technology.
Han Solo experienced an emergency landing on this planet at one point, and during his stay, he resolved a significant crisis affecting one of the planet's kingdoms.