What happened to China's former leader Hu Jintao?

It is a moment that for many observers has come to define strongman leader Xi Jinping's tightening grip on China: his visibly frail predecessor, Hu Jintao, being escorted out of a key Communist Party meeting during a five-yearly leadership reshuffle -- apparently at Xi's behest.

source https://www.cnn.com/2022/10/28/china/china-party-congress-hu-jintao-new-video-intl-hnk/index.html