This summary is not the rule. The rule text controls.
Here's a plain English summary:
When these rules ask for a written statement to be made under oath, there's another option available. Instead of swearing the statement in front of a notary, a person can use the process set out in Idaho Code § 9-1406. This law allows people to certify or declare that something is true without needing a notary to witness it.
This also applies to affidavits. Anywhere these rules mention an affidavit, that includes a written certification or declaration made under Idaho Code § 9-1406. In short, this rule makes it easier for people to submit sworn statements to the court by giving them a simpler way to confirm their statement is true and accurate.