To make it even clearer: Are the "Paid in this block" BTC really paid in "this" block and if so, how? And if not, how then and why? 
I think "rewarded in this block" would be more accurate, since the part that exceeds 50BTC may not be paid out in the same block even if the user is over the threshold. But they are guaranteed rewards, and will be paid out later.
It seems that when the pool has funds it pays out the whole 50BTC income to miners in later blocks, and instead adjusts the "server funds" by internally moving bitcoins from the "outstanding rewards" pile. In short blocks, that would mean that miners still get paid the whole block income even if the table says "paid in this block: 10BTC". So, "rewarded" would work better there as well.
