Depends on how and what you are counting, I suppose. I think the Cultural Revolution killed something like 50 million. But mostly through famine, maybe. Maybe he just means a million dead by security forces alone.
The Great Leap Forward ‘58-’63 killed that many.
BTW we shouldn’t get too cocky tho - the environmentalists/globalists are slow rolling us into our own version today.
He starved the bulk of them.
“The Four Pests campaign (Chinese: 除四害; pinyin: Chú Sì Hài), was one of the first actions taken in the Great Leap Forward in China from 1958 to 1962. The four pests to be eliminated were rats, flies, mosquitoes, and sparrows. “
Guess what happened? No sparrows to eat the insects. Genius!