This summary is not the rule. The rule text controls.
Even in cases where a jury trial isn't required by law, a judge can still choose to bring in a jury to help decide the case. This is called an advisory jury. The jury listens to the evidence and gives its opinion, but the judge doesn't have to follow what the jury decides. The judge still makes the final call.
This rule simply confirms that judges keep this power. It doesn't create a new right or take one away. It just makes clear that courts can still use advisory juries the same way they could before these rules were put in place.
For someone involved in a lawsuit, this means a judge might ask a jury to weigh in on certain issues even if you're not entitled to a jury trial for your type of case. But remember, the judge has the final say, not the jury.