This summary is not the rule. The rule text controls.
If you're a lawyer working under someone else's direction, like a junior associate at a law firm, you still have to follow the rules of professional conduct yourself. You can't break an ethics rule just because a boss or supervisor told you to do it. Being told to do something doesn't get you off the hook if that something violates the rules.
That said, the rules give some protection when things aren't clear-cut. If there's a genuine gray area about what the right ethical move is, and your supervisor makes a reasonable call on how to handle it, you're allowed to follow that decision without getting in trouble yourself. This only applies to real judgment calls on unclear issues, not to situations where the right answer is obvious and your supervisor just tells you to ignore it.
Breaking this rule is serious. The most severe punishment allowed is disbarment, which means losing your law license entirely.