I’m reading about the Devine Hunter,
and the way im reading it around 4th level or so
They can get a second AC us this right?
If the divine hunter selects the animal domain, she does not gain a second animal companion upon reaching an effective cleric level of 4th. When the divine hunter would gain that ability, her animal companion instead gains two ability score increases (gaining +1 to two different ability scores or +2 to one ability score). If her animal companion dies or is released, when she gains a new one, it benefits from this ability score increase
So if you choose something other then Animal
Domain you qualify for a second AC?
No, normally Animal Domain gives a Companion, Divine Hunter looses that Domain Ability and gets ability scores on current companion as a replacement.
The only domain that gains an animal companion is animal. So even if choosing another domain qualifies you to gain a second companion nothing is granting it so you don’t gain it. By putting the qualifier on the animal domain it makes it clear that you only get a single animal companion.