I think it's implied that your short statement should explain why you were unable or unwilling to take the test. I would agree with
@RJB1690 that "Encouraged" is not a small or gentle word in this context. Generally I think applicants should avail themselves of every opportunity to show their excellence, so doing the "optional" interviews, answering the "optional" essay questions and proffering the "optional" test results. Last year there were many who couldn't get a test date due to mass cancellations and travel restrictions, and I think that's a strong answer if it happens again this year, but it probably won't.