This summary is not the rule. The rule text controls.
If you think the person taking a deposition (usually a court reporter or officer) isn't qualified to do so, you need to speak up quickly. You must raise this objection before the deposition starts, or as soon as you realize there's a problem.
If you wait too long to object, you lose your right to challenge it later. This means you can't sit through the deposition, wait to see how it goes, and then complain about the officer's qualifications afterward if you don't like the outcome. The law expects you to point out the issue right away, either when you first learn about it or when you reasonably should have discovered it by paying attention.
This rule exists to keep depositions moving forward smoothly and to stop people from using technical objections as a strategy after the fact. If you have concerns about who is running the deposition, raise them immediately so the issue can be fixed before things proceed.