And, I disagree... If was printed its canon. But,
Excalibur #52 was just poorly written as if Alan Davis never read an X-Title in his life -- especially the part where with Jean's help to break down Phoenix's defenses, Xavier projects Excalibur into Rachel's mind, where the Phoenix then proceeds to share with them its history: from birth to its encounter with Feron & Necrom, then, much later, Jean Grey; it's subsequent "death"
(What, wait?!? who died again?), after which it first encountered Rachel, who had sent her mind back in time, and learned of her horrific future; how it sent a portion of itself back to the future with Rachel were, at the urging of Kate Pryde, used its power to send Rachel physically back in time
(back to the Earth-616 as opposed to remaining in the Earth-811 timeline to prevent what Rachel set out to do in the first place) and suppress her memories. But, hey for the sake of argument, I think we can amicably agree to disagree at this point.