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. If a junior lawyer breaks the rules, they can't use "I was just following orders" as an excuse.
That said, there's some protection for junior lawyers who are following instructions in good faith. If a question about proper conduct is genuinely unclear or debatable, and a supervising lawyer gives a reasonable answer about how to handle it, the junior lawyer can follow that guidance without getting in trouble. This only applies when the issue is truly a judgment call, not when the answer is obvious.
In short, junior lawyers can't hide behind their bosses when it comes to clear ethical violations. But when a situation is genuinely gray and open to interpretation, they're allowed to trust a supervisor's reasonable judgment call without facing punishment for it later.