It is enforcable but EU has been quite cautious and conservative with its enforcement approach.
China has a ton of laws aimed to suppress political dissent, and a good chunk of their laws/regulations would be even more unenforceable if they adopted an EU style approach. Of course, China means business, so they just go ahead and deploy the sledgehammer: you are banned from China unless you comply with the law. You typically can't even read the letter of the law and implement what it says verbatim; if you violate the spirit of the law (that is, don't disseminate anti-CCP content) you will still get the banhammer.
It's all about what political capital you're willing to give up to enforce the law.
China has a ton of laws aimed to suppress political dissent, and a good chunk of their laws/regulations would be even more unenforceable if they adopted an EU style approach. Of course, China means business, so they just go ahead and deploy the sledgehammer: you are banned from China unless you comply with the law. You typically can't even read the letter of the law and implement what it says verbatim; if you violate the spirit of the law (that is, don't disseminate anti-CCP content) you will still get the banhammer.
It's all about what political capital you're willing to give up to enforce the law.