He paid a company called Edge (http://edgefinite.com/) to extend the functionality of TT (https://www.tradingtechnologies.com/products/trading-analyti...).
Page 49 of full CFTC document - https://www.dropbox.com/s/ego1blhnylgs7sx/Appendix.pdf
"I asked Edge to design 3 more functions specifically to help try and hide my orders from these people. I do not know if this can be described as HFT, to me it is just giving me the ability to have some extra functions that my base trading software (TT) does not give me..."