Thanks for pointing out that it was (likely) CC, and not the main writers. It's important details for me to know.
I know Lorna's history can't be changed. However, history does not need to be changed for her to not be stuck next to him on a panel. This isn't "let's redraw the House of M portrait to remove Lorna from the family" stuff like the Avengers franchise pulled. Jean (relevant as who Madelyne was modeled after) currently isn't her friend. Cable isn't her kid. Havok isn't (and shouldn't be) her boyfriend. This is a moment she doesn't have a strong stake in, so there's no reason she can't be off the page.
On the flipside of this: Marvel's repeatedly done storylines that involve Genosha this decade, yet they haven't acknowledged Lorna's history with Genosha in any of them. Axis happens, Lorna's fighting a hate wave instead of fighting Red Skull for having the gall to exploit the tragedy she survived. As I understand, Jean recently had a storyline involving Genosha as well, yet Lorna didn't come up at all. Or if we talk just Havok-related scenes, Marvel recently conveniently left out the parts of Austen's run in reprints that involve Havok having left Lorna at the altar.
Why should I be expected to accept Lorna on this page with Havok because "history can't be changed" when Marvel's fine with changing history to exclude her from Genosha or to omit Havok leaving her at the altar?
There's another element to this, though. In addition to everything I said above, this is a 'testing the waters' kind of move. "Oh, Lorna with him in this scene is fine because it's historical? Sweet, then let's do tons of flashbacks to the Claremont era where they were a couple, and make that most of the scenes where we include her." I'm not expecting anyone else to see it this way, but I'm always eager to get ahead of the curve on things like this.