Hi there,
The cat info you posted is for a cat that is indeed older, so it has love/breed OFF, but the info shows this cat is not a PermaPet, which means it will still need kibble to eat in order to stay healthy. Cats over 120 days old (or with love/breed OFF) eat half as much kibble & will still get sick after 3 days of not eating kibble.
You mentioned not having to feed the cat, that could be due to someone else on the region having food out that was set so your cat could access it & now they either changed the settings on their food or no longer have food out, which would be why the cat suddenly got sick. You could have also had food out still somewhere that you weren't aware of (though that would be alot of bowls of food to have reached over 3000 days without new bowls being set out).
If you wish for the cat to no longer eat kibble, then you can turn it into a PermaPet with the PermaPet120 vitamin from the store.
I hope this clarifies things, please feel free to file a support ticket if you have any further questions and our team will be happy to help