The thing you're quoting is about regular up/down votes on a question.
You can only vote to close once, and you can only retract the vote once. After that, you cannot vote to close again unless the question is re-opened.
For more details, see the relevant feature request on MSO: Can we have the ability to retract a close vote before it closes?Can we have the ability to retract a close vote before it closes?
When you retract your vote, the confirmation dialog informs you that you cannot vote again after retracting your initial vote: