Look, China IS an authoritarian and oligarchic country.

Authoritarian is a largely meaningless pejorative to simply signal "enemy of the EuroAmerikan empire".

But more importantly do you actually know what oligarchy means?

The Chinese government is made up of roughly 3 million deputies with the vast majority being directly elected at the town/city and county level (~2.5 million). The CPC has over 100 million members that's over 1 in 14 people. The NPC has ~3000 members made up of workers from every strata of the working class where all 55 ethnic minority groups are guaranteed at least 1 representative with many having more. If China is an oligarchy then so too is every nation on earth and if that were true what point is there in specifically using it to label certain countries other than as short of hand for not aligned with the imperial core much like "authoritarian".