Agree. The school needs to be TO-friendly overall, and the student needs to be a highly qualified applicant; in that scenario, ED can provide an advantage because the highly qualified student is in a smaller pool. But ED won’t help at a school that is technically TO but not especially TO-friendly.
ETA: I would consider Cornell now to be not especially TO-friendly. My kid applied ED to Brown TO this year, and it became evident over the course of the year through different comments school officials made that they preferred tests and were likely to revert to test-required. Kid was rejected—as he likely would have been with test scores, of course, but a classmate of similar “stature” (for lack of a better term) with test scores got in. So unless your kid has a truly exceptional record, I think applying TO to Cornell in their last TO year is not a good bet, in any round.