This. The entire test is fine tuned to let the officer pen a police report that makes you look drunk without having to actually lie in an observable way vs the dashcam/body cam.
They'll tell you to stand on the line, you'll pass, they'll make small-talk, they'll tell you to say the ABCs backwards, you'll pass, and they'll write "suspect was unable to remain on white line while saying ABCs backwards" in the police report and in the court the prosecutor will ask "did the officer ever instruct you to stop standing on the white line?".
They'll tell you to stand on the line, you'll pass, they'll make small-talk, they'll tell you to say the ABCs backwards, you'll pass, and they'll write "suspect was unable to remain on white line while saying ABCs backwards" in the police report and in the court the prosecutor will ask "did the officer ever instruct you to stop standing on the white line?".