You say "thoroughly debunked" but this is what your article says:

It’s true that, building on earlier initiatives, China’s State Council published a road map in 2014 to establish a far-reaching “social credit” system by 2020. The concept of social credit (shehui xinyong) is not defined in the increasing array of national documents governing the system, but its essence is compliance with legally prescribed social and economic obligations and performing contractual commitments. Composed of a patchwork of diverse information collection and publicity systems established by various state authorities at different levels of government, the system’s main goal is to improve governance and market order in a country still beset by rampant fraud and counterfeiting.

Under the system, government agencies compile and share across departments, regions, and sectors, and with the public, data on compliance with specified industry or sectoral laws, regulations, and agreements by individuals, companies, social organizations, government departments, and the judiciary. Serious offenders may be placed on blacklists published on an integrated national platform called Credit China and subjected to a range of government-imposed inconveniences and exclusions. These are often enforced by multiple agencies pursuant to joint punishment agreements covering such sectors as taxation, the environment, transportation, e-commerce, food safety, and foreign economic cooperation, as well as failing to carry out court judgments.

These punishments are intended to incentivize legal and regulatory compliance under the often-repeated slogan of “whoever violates the rules somewhere shall be restricted everywhere.” Conversely, “red lists” of the trustworthy are also published and accessed nationally through Credit China.

In other words, there isn't literally a singular social credit score for everyone in China, but the government does indeed collect vast amounts of surveillance information about your compliance with its draconian laws and obligations from a wide range of agencies and compile that into a list of services you should be blocked from and so on. So it "doesn't exist" in a very narrow literal sense, but definitely does practically speaking. This is hairsplitting technicalities to get away from reality.