The Communist Party is based in the Leninist principle of “democratic centralism”. This means “debate within the party, unity in action”. It is meant to make the party more powerful by allowing dissent and debates within the party, but when it comes to taking action, all members are expected to follow the consensus even if they disagreed with it.

Since China’s Congress is primarily members of the Communist Party, this means that the decision of the president ultimately originates in the Communist Party itself. After they reach a consensus, the whole party will vote for that consensus in the Congress. While there technically are smaller parties in China’s Congress, they act more as advisors, since it is not practically possible for them to overturn the vote, since the CPC always votes in unity.

Formally, China’s president is elected by the Congress. But the decision of who to elect largely comes back to the CPC itself before they come to a consensus. So the final decision largely originates in the Politburo and the Central Committee.

The president in China is harder to shift on a dime than like in the US. The president is not elected by a nation-wide vote but by the Congress itself. To change who the Congress elects, you have to change the opinions of the largest party in that Congress, you have to change the opinions of the CPC

Xi is not technically a dictator in the same way that Putin is not technically a dictator. He is in control of a governing body that could replace him on paper, but never will. And he has dictatorial powers without real checks/balances. And, to return to my original point, it may appear that this system is fine if it produces a good result, but the power of the government should come from the will of the people.