Many leftist label them as ‘imperialist’

Of all places, The Atlantic: The Chinese ‘Debt Trap’ Is a Myth

and biggest provider of the capitalism.

Those states were already capitalist. China is helping their indigenous bourgeoisie gain independence from imperialist states. Once a state is out from under the imperialist boot, it will open up the possibility for the indigenous proletariat to make revolution.

if they are not careful, their market socialism can devolve into capitalism.

Yes, that is a known, calculated risk, and China must remain vigilant against its bourgeoisie translating its fiscal capital into sociopolitical capital. The state gave Jack Ma the slapdown because he got too lippy.