Kayle and Morgana are now listed under Demacia?

They are probably from there. Then all the angel stuff happened..

They're about to be reworked. Maybe new lore and stuff?

I vaguely remember reading about kayle quite a while back as a reference somewhere in the demacian lore pages. I think theres an obscure reference to her or someone who looks like her as some kind of deity so I'm not surprised theyre listed under demacia now. As long as their godliness isnt retconned leaving them as regular demacians or some other kind of effectively ascended boringness like the darkin got shafted with i think itll be fine.

Riot changes lore all the time. They rarely announce it if they end up changing things majorly. The writing staff is more interested in establishing their own stories ( the one the writing staff wants to tell) than caring about what any of the people playing the game, and experiencing the lore for the past NINE YEARS.

They just change things and expect you to be invested in it.

There were like 5 threads that talked about this when Kayle and Morg got announced as the next big reworks.

The basic summary of them all was "Kayle was affiliated with Demacia before and Morgana with Noxus. I don't know why they're now both connected to Demacia now but lets wait for their new lore to explain that and go from there"