Demonstrating a lack of ethical values in personal life seems like a good measuring stick to whether one might demonstrate ethical values in a professional setting. But more importantly, how can participants interact with any event or process of an organization if they cannot trust those involved?

Yes, but I don't see the relevance. The use of the term "social credit system" is intended to imply an system of political oppression and censorship similar to that used by the Chinese Communist party, and further to create fear of the implied radical leftist/progressive agenda assumed to be behind codes of conduct by associating them with violent authoritarianism.

Being banned from a private venue is an expression of the right of free association. It is not a violation of anyone's rights, because one does not have a right to attend a private venue. It is not a form of political oppression or censorship, because one does not require attendance at a private venue to express one's political beliefs.

Therefore, because the rights of banned attendees have not been violated, nor their speech suppressed, nor has any violence been imposed against the banned attendees, or critics of the code of conduct, said code of conduct is not equivalent to the policies of the Chinese government or a social credit system.