This summary is not the rule. The rule text controls.
Every lawyer has to follow the rules of professional conduct, even if a boss or senior lawyer told them to do something a certain way. Being told to do something by another lawyer doesn't excuse a violation of the rules. Junior lawyers can still be held responsible for their own actions.
That said, there's some protection for lawyers who are just starting out or working under someone else's direction. If a senior lawyer looks at a tricky ethics question, one where reasonable lawyers could disagree, and comes up with a reasonable answer, the junior lawyer who follows that advice is off the hook. They won't be in trouble for going along with a reasonable call made by their supervisor.
This rule basically balances two things. It makes sure lawyers can't hide behind orders from above to justify clear ethical violations. But it also recognizes that junior lawyers often have to trust the judgment of more experienced lawyers on genuinely difficult questions, and they shouldn't be punished for reasonably relying on that guidance.