Thank you for your words, I think at the beginning of the story the narrator and Arlong himself were convinced that the colonel was human, but it doesn't have to be that way.
Arlong essentially looks like a human, behaves like one, has free will (as long as he doesn't cross the line) but Arlong is the new race of "humans" with whom the sentinel architects plan to repopulate the earth.
“You didn’t mean to what?” Arlong ensured that he maintained an upper-hand. The sentinels were smart AI and could sense human emotions from miles. If they ever sensed fear, then only the Almighty would have to intervene to save the human bosses from the sentinel’s wrath. After all, these were created to exterminate humans; the enemies of the bosses.
This is the part that deciphers the enigma, if the sentinels were made to exterminate humans, why do they take orders from them? and why can't they read Arlong's emotions if he's clearly distressed by what's going on?
And from that thread, I threaded my story.
Not everyone in this world is cyborgs, humans live in crowded suburbs, are hunted by sentinels, and are eventually used in experiments to transfer human traits to machines.
There are a lot of details that I can't break down due to the 500 word limit, but I know that somehow they are there, and I would like you to notice it, but it's hard to do.