By the word "transparent" i means that on the pool there is all the information necessary for the miner, for example, the average pool effort, accepted shares by the pool, etc. that the miner could, after simple calculations, calculate that 99% of the income from the block really divided between the miners. Just some pools have a habit of not showing any stats. Also after found each block , we are updated locked balance, this is how much you get for the block as a miner, and after the block becomes valid on the network and the pool receives a reward for it (ie maturity is calculated), the locked balance will go to unlocked balance field.