Yes, that’s confusing, but then there was the secondary twist that the Red we know is not the Raymond Reddington who is Liz’s father.
Of course, despite The Blacklist’s convoluted history of events, we have been told that Red is not Liz’s father.
Mainly, there was the Season 6 reveal in which we learned Raymond Reddington was Liz’s father.
A comment on a thread about the “Chemical Mary” episode on Reddit gets snarky about the show’s history with this particular storyline, with one commenter noting, “So today Red is not Liz’s father.”