This summary is not the rule. The rule text controls.
A person acting as a neutral (like a mediator or arbitrator) needs to actually know what they're doing. If a case involves issues that go beyond their skills or knowledge, they have a duty to speak up about it.
This can happen in a few ways. The neutral might turn down the case from the start if they know it's not something they're qualified to handle. If they're already working on the case and realize partway through that it's too complex or technical for them, they can bring in outside help or expert assistance. And if the situation is serious enough, they may need to step down from the case entirely.
The point of this rule is to protect the people involved in the dispute. They deserve a neutral who actually understands the issues in their case, not someone who is guessing or in over their head. This keeps the process fair and trustworthy for everyone involved.