It's not that he sold the same thing twice - it appears he has sufficent mining power to back all his sales.
Where does this appear?
I just checked Bitminter and he's mining there with about 170GH/s.
http://bitminter.com/livestats/bigUnless he's also mining somewhere else there seems to be a shortfall. He sold 200GH/s of bonds and 170 is 85% of 200. This is from the OP:
What if you have technical issues/downtime?
I have more than 210 Gh/s operating with a total capacity beyond 300 Gh/s. Should there be any downtime, I will contribute hashes from my personal farm to ensure the full dividend is paid each week.
Liar.