I worked on the production of that year’s show, and the preceding year as well. I was up in one of the press rooms when it happened, and I don’t think it was pre-planned. Although the Academy was watchful for some kind of incident because the previous year was when Sasheen Littlefeather showed up to accept Marlon Brando’s award. That was stressful behind the scenes, lol.
Oh, and I have never watched one single Oscar show since I worked on it.
Even that was phony:
“Marie Louise Cruz (November 14, 1946 – October 2, 2022), better known as Sacheen Littlefeather, was an American actress, model, and activist on behalf of Native American civil rights.”
https://en.wikipedia.org/wiki/Sacheen_Littlefeather