That address belongs to the owner of CKPool. He charges 2% of every block reward, if your miner solves a block.
That's 9 blocks in (almost) half a year, or one block every 20 days.
Yes, but consider that not all miners in CKPool are lottery miners. Most people who find blocks there have a lot more than just 1 TH/s. If you visit
eusolostats.ckpool.org, you can see that right now, 42 PH/s are directed to that pool. (And another
167 PH/s in the American pool.) I think only three people have ever found a block with Bitaxe. One of them was the one referred in the OP:
https://bitcointalk.org/index.php?topic=5237323.msg66076933#msg66076933.