Get your taxes done using TurboTax

If your wife spent more than 183 days, she's a resident alien regardless. if she files as a dual-status alien, it means that she wouldn't qualify as a US resident but can make the election to qualify as a Dual-Status Citizen for tax reporting purposes.

Now to address your concern, even though the language doesn't mention Dual-Status citizens, it's irrelevant in the context of this form. It assumes that if your wife is a nonresident citizen who'll be treated as a resident alien for tax reporting purposes. In fact, on the bottom of the form it mentions that the spouse is either a nonresident or a dual-status resident and makes no distinction on her status. See the screenshot i have included below.