Is Nethereum's GetContractQueryHandler decentralized? If not what's a decentralized alternative for C#?

I have an app I'm building that MUST be 100% decentralized. The app is in C# so Nethereum looked like the most trusted ethereum package for C#. The docs provide this example of how to get the NFT balance of a particular address http://docs.nethereum.com/en/latest/Nethereum.Workbooks/docs/nethereum-managed-accounts.workbook/.

var balanceOfFunctionMessage = new BalanceOfFunction() { Owner = account.Address, }; var balanceHandler = web3.Eth.GetContractQueryHandler<BalanceOfFunction>(); var balance = await balanceHandler.QueryAsync<BigInteger>(contractAddress1, balanceOfFunctionMessage); 

Is this decentralized? I don't see how this could work without calling out to a URL for a Geth node which I believe would make the NFT balance query centralized. I'm hoping that this process is somehow decentralized. Maybe Nethereum reaches out to get the balance of several nodes in a decentralized way without going through a singular gateway? Can someone please tell me how decentralized or centralized Nethereum's method of querying the NFT balance is?

If the code in the Nethereum docs example that I provided is not decentralized. Could you provide me with the most decentralized alternative?