It has been stated multiple times by OP that the freshly mined coins are sold at premium rate and hence can not be paid to customers. But the stuff u r smoking never allowed it to get into your brain.
They don't have to pay them to customers. But if they are mining, they can prove it by showing the address and signing the address. Then they are free to sell the block for a premium if they want. So you see, there is absolutely no reason to hide the mining, that is, unless they aren't mining.
You are asking Q that they answered before. If they disclose the address, then fresh coins at that address will lose its weight and they wont be able to sell it at premium price.