It is extremely easy to pass it as a political propaganda at first glance. However, it would extremely foolish to do so. What happened to Mao and his party was exactly like what ancient Romans had said: Absolute power corrupts absolutely.
However, what happened to Mao and his party after the revolution cannot be used to mitigate what Chinese people accomplished under his leadership before the revolution. Denying past accomplishment of Mao and his party, as well as Chinese people and those great internationalists who helped China to fight Japanese fascists invaders would be as foolish as, and as racist as denying the existence of in USA simply because blacks in USA enjoy better living standards than blacks in Africa & Latin America.
However, what happened to Mao and his party after the revolution cannot be used to mitigate what Chinese people accomplished under his leadership before the revolution. Denying past accomplishment of Mao and his party, as well as Chinese people and those great internationalists who helped China to fight Japanese fascists invaders would be as foolish as, and as racist as denying the existence of in USA simply because blacks in USA enjoy better living standards than blacks in Africa & Latin America.