Let’s take a look at how Kumbhkaran is described in general
Pg 269 from the book you shared
He sleeps (not because he is machine and needs maintenance but because of curse given by Lord Brahma. If you think he sleeps because of machine then how would you justify curse. You can’t.
- That raksasa sleeps for six, seven, eight, even nine months at a time. Nonetheless, you must awaken mighty Kumbhakarna immediately.
Kumbhakarna breathes. Like any living creature.
18–19. As they passed through the huge gates into Kumbhakarna’s lovely cavern, which extended a league on every side and was redolent with every fragrance, the immensely powerful raksasas were driven back by the force of his breath
He has body hairs. Breathes from nostrils
22-23. …tiger among raksasas, sons of chaos, as ahe lay there, his body hairs bristling, hissing like a great serpent, and terrifying them with his stertorous breathing. With his fearsome nostrils and his huge mouth as wide as the underworld Patala, he was fearsome to…
He was offered meat to eat. That’s what would be offered to living creature. Not a robot.
- Then those mighty raksasas placed before Kumbhakarna a supremely gratifying heap of meats as huge as Mount Meru.
- Those tigers among raksasas, sons of chaos, set down massive quantities of deer, buffalo, and boar—an astonishing heap of food.
He stretches his arms after waking up and yawns. That pretty much tells that it is not yantra or machine.
- Stretching wide his arms, which were as strong as mountain peaks and resembled two mountain peaks or great serpents, that night-roaming
raksasa yawned grotesqu
Under Sarga 49
Kumbhkarna is “son” of Visravas. Not yantra of Visravas.
- ‘‘That is Kumbhakarna, the valorous son of Visravas, who defeated both Vaivasvata and Vasava in battle
Note the word born.
- ‘‘No sooner had this huge raksasa been born than, tormented by hunger, he devoured many thousands of living beings.
4.1.37 says he was born along with Ravana and Vibhishana. Not like robot.
Viśravā had two wives. The first wife was Iḍaviḍā, from whom Kuvera,
the master of all Yakṣas, was born, and the next wife was named
Keśinī, from whom three sons were born-Rāvaṇa, Kumbhakarṇa and
Like others have commented as well there are more evidences to show that he is NOT yantra. For eg Kumbhakarna got married to daughter of Bali and had sons.