The https://deep-index.moralis.io/api/v2/nft/address/owners route for this contract address 0xd1d411d2da363144248b98adab453aa3b19ccf04 returns 13,529 unique owners, when Etherscan shows unique 13,496 addresses. Whenever Etherscan updates, so does the proportional amount by Moralis. I do this for about 200 collections, some are spot on, others are off by a few, while others like this collection is off by a few percent.
After waiting a day for it possibly to update, it still returns 13,529 from my side of code (tried two different methods, same results)