This summary is not the rule. The rule text controls.
When someone files a motion that relies on facts not already part of the official court record, there needs to be a way to prove those facts. This rule gives the judge some flexibility on how that proof gets presented.
Normally, the parties can back up their claims with written statements made under oath, called affidavits. But the judge isn't limited to just paperwork. If the judge wants to hear directly from witnesses, they can order that some or all of the evidence come through spoken testimony in court, or through depositions instead.
In short, this rule lets the judge decide the best way to get to the truth when deciding a motion. If written statements seem like enough, that works. If the judge thinks it's better to hear people testify in person or review deposition testimony, they can require that instead.
