Too late Oprah. The correct action was to state this in the days and weeks after the interview when the media was debunking all the stories and statements the Harkles spewed out. Oprah didn't, even when she was raked over the coals for her interviewing style with them.
I don't believe for one minute Oprah's assertion that Harry and Meghan didn't know any questions that she would be asking them. They knew exactly what Oprah would ask so they could rehearse they're responses. Oprah's reputation took a gigantic hit and she knows it.