This summary is not the rule. The rule text controls.
Here's a plain English summary of this rule:
Oral argument doesn't happen automatically in every case. If you want the chance to speak in person before the court, you have to file a written request asking for it.
Even if you ask, it's not guaranteed. The presiding judge or the court will decide whether hearing spoken arguments would actually help them understand the case better. If they don't think it's needed, they can decide the case without holding an oral argument.
This means you should explain in your written request why oral argument would be useful. Simply asking for it isn't enough. You want to give the court a good reason to believe that hearing from you directly will help them make a better decision.