This summary is not the rule. The rule text controls.
Here's a plain English summary of this rule:
If you're a lawyer licensed in Nevada, you have to follow Nevada's rules of conduct no matter where you're working. Even if you move to another state or handle a case somewhere else, Nevada can still discipline you if you break the rules. Getting licensed in Nevada means you're always answerable to Nevada's system for holding lawyers accountable.
This matters for clients because it means your lawyer can't dodge responsibility just by working outside Nevada. If your Nevada-licensed attorney does something wrong while practicing in another state, you can still file a complaint and Nevada can still take action against them. The license follows the lawyer, and so does the duty to act properly.