Supercomputing is Back

Remember when @supercomputing dominated the mining queue? Well, it looks like he is back.
At the time, supposedly he was exploiting a loophole that has been fixed in the Aug 15 hard fork. Now, his graphics-card themed miners are back in the miner-witness queue: "gxt-1080-sc-00??".

Has he found another loophole, or is it GPU mining, now, really?