I was wondering how he ended up and the biography on Wikipedia is unclear on how his life may have improved after publishing his results. He published in 1978 and passed away fifteen years later. Other than a note that he joined The Party in 1991 there is no information on his last years.

I am not sure what to make of the information that is given. Does it imply he was treated poorly, even tortured, until 1991 when he relented?