It wasn’t a conspiracy, it was a $#%& up. We recruited fighters, used them, then were stupid enough to be shocked when they turned against us. Known facts.
http://theweek.com/articles/589924/brief-history-isis
Fast forward to the U.S. “surge” in 2007: The U.S.-installed, Shiite government in Baghdad began reaching out to Sunni tribes, encouraging them to reject AQI. By this point, AQI was basically defeated and it looked like peace was coming to the Middle East (kinda).
The article that you linked says nothing about the US recruiting AQI. I think that you may be confusing Syria during the Obama Administration (when the US did covertly support a variety of jihadis) with earlier times in Iraq. AQI existed in Iraq as a guest of Saddam’s government for at least a decade.