Yeah, if you read my section on population it briefly mentions there being "a few million in the Zanjir Islands" so I'd say that 20-30 million in just your part is a bit...unprecedented. But to be fair these islands are rather big, and your elves probably haven't been committing massacres/supressing revolts as much as Tin, so you wouldn't have killed nearly as many of the natives.
In any case, it doesn't matter. A large amount of those natives aren't considered citizens (or people) by the Sultanate and therefore were not in my population count. Just my way of hitting two birds in one stone: staying vague so I don't have to figure out exactly how many people there are, and showing just how much it sucks to be under occupation by Tin.
As in for occupation, given the islands' isolation I had imagined the natives to be really primitive. Think the Maori native to New Zealand. They never had seen or used guns until they fought Tin's missionaries and colonists and stole some civilian-class firearms.