Earlier quoted context omitted.
Perhaps you would prefer an analogy to law where there are things which are illegal and they may not precisely correspond to the things which you personally consider unethical?
I mean, I understand that laws and professional ethics are enforced. But that doesn't make any of them anything other than opinions.
Sure, in the same sense that any law is an opinion of the body that defined it, e.g. "It is the opinion of the legislature that a person who commits the unlawful killing of a human being with malice aforethought shall be guilty of murder."
It's an opinion, but it's an opinion with real-world consequences... just like professional ethics, according to the atricle.