Yeah even if there were a deeper meaning to xur, it's probably locked deep inside the mind of some concept artist. Xur was probably the brainchild of some guy who either randomly came up with a name and a minuscule story or someone that thought it was better to keep him a mystery. It's obvious that bungie likes to put random neck-beard tag lines in their game to appeal to people. Half the weapon descriptions are just action-movie-esque tag-lines/confusionisms that serve no purpose other than giving neck-beards something to emulate when they create their Reddit signature. It's only rarely that the grimoire/lore ever actually leads to something genuinely insightful.