This summary is not the rule. The rule text controls.
If you're having someone's deposition taken in a Tennessee civil case, the person doing the deposition (like a court reporter or officer) can't have a personal stake in the outcome of the case. This rule keeps the process fair by making sure the person recording testimony has no connection to either side or the case's result.
For example, someone can't officiate a deposition if they're related to one of the parties, work for one of the attorneys involved, or stand to gain money or some other benefit depending on how the case turns out. If a person does have this kind of conflict of interest, they're disqualified from serving in that role.
The specific rules on what counts as a disqualifying interest are spelled out in Tennessee state law under T.C.A. §24-9-136. If you have questions about whether someone involved in your deposition has a conflict, you can look at that statute for more detail or ask your attorney to check it out.