As you have shared in your photo, If you found a block and submit it to the bitcoin network through your node (independent from the template you are using), there is no possible way for that pool to stop that block from spreading through the bitcoin network. In this case OCEAN is just providing you the coinbase transaction but there is no way for them to invalid a found block published to the network.

Also if payouts are introduce in the coinbase transction changing them will invalidate the hole block, making it imposible for the pool to change the payouts after the found is found, so yes dezentralization can be possible with a pool.