Story finally posted on ZH.
The 2012 incident refers to when dozens of US spies were reportedly caught red-handed in China. Very likely this major bust-up of an alleged CIA network was a key trigger for President Xi Jinping’s anticorruption drive, given that government corruption left Beijing exposed to vulnerabilities by Western spy agencies. Dozens of CIA assets were reportedly imprisoned between 2010 and 2012, and others reportedly executed. In 2018, a Foreign Policy report estimated that the number caught consisted of 30 CIA assess, and described further the spy ring was discovered largely due to a botched communication system.
https://www.zerohedge.com/geopolitical/report-dives-recent-cia-failures-china-no-real-insight-leadership-plans