That applies to your personal information, and your answer to Question 7 (if you are exempt from withholding entirely), which is the only affirmative statements you make on the form.

Lines 5 and 6 are choices the taxpayer makes based on their expected level of withholding. The worksheet is not submitted, and not completed under penalty of perjury.

You can absolutely over-withhold and just put zero. The IRS has zero issue with that whatsoever.