ISOT The North+Beyond-The-Wall+The Lands of Always Winter replace Atmora?

[CarlManvers2019]

This occurs right before Aegon’s Conquest and every single Northerner, resources and equipment and belongings included, end up transported back to Northern Westeros

Which has now replaced Atmora

This switch on Elder Scrolls’ side occurs during the Empire-Dominion War and even though they’re too busy, the people of Nirn somehow know that something changed

Do they have zero effect on one another for centuries?