I don't know. I mean, "never argue" is not a good maxim, imo.

But sure, ultimately your role is to provide your opinion as an expert, but you should step aside if your manager decides otherwise after hearing you. I think it's also correct: you are responsible for the decisions you make (which is true for you and your manager too).

So I think the author should have softened the discussion rather than going for a full confrontation. The boss surely didn't react rationally, or didn't surface their reasoning properly.

But being able to argue with your superiors (and peers) "the right way" is one of the most important skills to have in the workplace imo.