Email verification before user creation

Question

According to the document, it is possible to have email verified when user().onCreate is triggered. From my understanding, you can send email verification link only after creating an account. How it is possible?

// On sign up.
exports.processSignUp = functions.auth.user().onCreate(async (user) => {
  // Check if user meets role criteria.
  if (
    user.email &&
    user.email.endsWith('@admin.example.com') &&
    user.emailVerified  // Is this can be true at this moment!?
  ) {
      // Grant access
    } catch (error) {
      console.log(error);
    }
  }
});