The key point...
Did you catch this little tidbit?
"The government employees here are not only wealthy materially, but also mentally healthy," he said.Translation: They are corrupt and looking the other way. Won't take much of a purge to restore the old system at all. Remember, Mao started from absolute scratch before. Here, they already have the government, and are far less squeamish about liquidating their citizens than the Russians were.
They are only biding their time.