If it's true from reading Total Film explaining interview said by Christopher Nolan has been working on the story of TENET from about 20 years ago; does that mean Memento was foreshadowing Tenet being conceived in his mind from that start of this sequence

If it's true from reading Total Film explaining interview said by Christopher Nolan has been working on the story of TENET from about 20 years ago; does that mean Memento was foreshadowing Tenet being conceived in his mind from that start of this sequence