Earlier quoted context omitted.
An autocratic government is inherently antithetical to the Rule of Law. They are mutually exclusive.
Please expand on what this "Rule of Law" proper noun you're referring to is. I am quite curious how it is a thing that democratic societies can have while tyrannies must lack it and I reeeeally suspect that your distinction will fall under a No True Scotsman fallacy.
China lacks such separation, the judicial branch cannot check the power of the party/official class, they cannot interpret law and they definitely cannot enforce what the official don’t want to enforce (see China’s constitution that with freedom of speech, assembly, and so on...). By definition, this concentration of power is authoritarian, so these things go hand in hand.