The great leap forward was such a colossal clusterfuck that you can’t blame it on any one thing (although most of them would be prevented without the authoritarianism). Literally everything was wrong. Sparrows, lysenkoism, forced collectivization (basically, and perhaps ironically, farmers not owning the means of production), Mao just being evil, backyard burners, rigid chain of command that gave the chairman absolute authority but at the same prevented him from knowing what was going on, everything.