I was wondering which version is now the "canon" of why the world ege mountains were adjusted and the karaz ankor (empire of the dwarves) shattered.

In the lizardmen book (and until recently) the explanation was due to the readjustment of the continents made by a mage Slaan. But recently in the skaven army book it says that what caused it was a skaven device that caused a very big explosion.

I am more inclined to believe the older (i think it have been like that since 5th edition) theory of the Slaan moving the continents. But i am wondering if the skaven book contradicts this theory, or if when it talks about the skaven device they refer to something else, like some local collapse of certain area, and not the whole world edge mountains.