Makes his complete commitment to the Party that much more interesting. I think Chinese leaders see the path they took - always venerating Mao (unlike the Soviets who denounced Stalin) and taking brutal action against any who would challenge the party’s power (in Tiananmen, unlike Soviet parties) as vindicating the approach of trusting the Communist Party. They firmly believe that only the Communist Party can control China and make it strong. Any reform like what the Russians did would leave them weak, like Russia is.
Obviously we can’t read his mind, but I’d guess that he justifies the Cultural Revolution as the right thing because the Party cannot be questioned. If you question that it opens up a whole can of worms that leads to the weakening and destruction of the Party.