This summary is not the rule. The rule text controls.
When a witness who has important information can't show up in person for a judicial discipline hearing, the law still allows their testimony to be used. This can happen if the witness lives out of state, is temporarily away from Louisiana, lives in a different parish than where the hearing is happening, or simply cannot appear for some other reason.
In these cases, the witness's testimony gets taken using the same methods already used in regular civil court cases in Louisiana. This usually means something like a deposition, where the witness answers questions under oath outside of the actual hearing, and that testimony is later presented as evidence.
This rule exists so that distance or scheduling problems don't stop important testimony from being heard. It gives everyone involved a practical way to get information from witnesses who can't physically attend the hearing.