it’s against the law in China to even say you don’t agree with the law
Your link doesn't support this, and it's nonsense on its face, anyway.
"Do not oppose the basic principles established by the Constitution" is not "you can't even say you disagree with the law," as anyone familiar with the difference between a constitution and subordinate forms of laws (e.g., statutes) can tell you. And of course you obviously can say the constitution should be changed; how else do you think they amended it in 2018?
Your link doesn't support this, and it's nonsense on its face, anyway.
"Do not oppose the basic principles established by the Constitution" is not "you can't even say you disagree with the law," as anyone familiar with the difference between a constitution and subordinate forms of laws (e.g., statutes) can tell you. And of course you obviously can say the constitution should be changed; how else do you think they amended it in 2018?