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 breaking the rules. A junior lawyer can't use "I was just following orders" as an excuse if their actions actually violate ethics rules.
That said, there's some flexibility for younger or less experienced lawyers. If a question about proper conduct doesn't have a clear answer, and a senior lawyer gives a reasonable decision on how to handle it, the junior lawyer can follow that guidance without getting in trouble. This protects new lawyers who are relying on the judgment of more experienced attorneys when the right answer isn't obvious.
The key difference is between clear rule violations and gray areas. If something is clearly against the rules, a junior lawyer must refuse to do it, no matter who's giving the order. But if reasonable lawyers could disagree about what's proper in a tricky situation, the junior lawyer is protected if they go along with their supervisor's reasonable call.