It’s a good quote but please don’t attribute it to anyone unless you have proof of it.

Someone did some investigating but found nothing concrete either: https://quoteinvestigator.com/2018/02/22/rope/

四年自然灾害

I think you counted one more year, it’s three years unless you’re referring to something else. 三年困难时期 or 三年自然灾害.

No need to waste time when you see someone mention these three events together:

Famine, Great Leap Forward, Cultural Revolution.

It’s the Chinese liberal equivalent of that “TIANANMEN MASSACRE. ORGAN HARVESTING. UYGUR GENOCIDE” trope.

(Hint: It’s aimed at Mao Zedong and the CPC)