Only, there’s absolutely not a single source that in any way, shape or form provides any sort of foundation for this statement of the Void or Old Gods being even remotely related to the cosmic force of Life what-so-ever.
Any additional details to their canonical explanation is nothing but speculation.
Old Gods (also known as Shath’Yar in their own language,[2] as well as various other names) are parasitic, eldritch horrors created by the void lords in order to find and corrupt slumbering titan Worldsouls. These immense mountains of flesh, physical manifestations of the Void, grow like cancers within the worlds of the Great Dark Beyond.[3]
https://warcraft.wiki.gg/wiki/Old_God
Additionally, as far as we know and have been told the manifestations left behind in Harandar and when Aln’hara was [for whatever reason] swept from the Cradle are solely made from her “screams of anguish” [whether literally or not can certainly be debated]. However, this very explanation is also the very foundation for the first boss of the first raid.
The Rift of Aln in the physical world was formed when Aln’hara was taken from her cradle in Harandar. The violence of the act left a wound that will not heal, where Aln’hara’s screams of anguish gave life to formless terrors. It is said that those who enter the Rift of Aln are driven mad.[4]
https://warcraft.wiki.gg/wiki/Rift_of_Aln#History
In the Dreamrift raid, the Shul’ka and adventurers battle Chimaerus the Undreamt God, which feasted on the void of pain and madness left behind in the rift after Aln’hara was taken.
https://warcraft.wiki.gg/wiki/Rift_of_Aln#Midnight
Adventure Guide
When Aln’hara was taken from her Cradle, only pain and madness was left to shape the chaos of the rift. Chimaerus feasted on the void left behind, gorging itself on other nightmarish manifestations. Now it stands as the monster within the rift - a being of agony and rage.
https://warcraft.wiki.gg/wiki/Chimaerus
To the best of our knowledge and the story as it has been presented, it has f@#$ all to do with the Old Gods. It might very well be the that worldsoul was cut off [if Azeroth truly is Aln’hara] and swept from Harandar and the Cradle [in whichever form or influence she was present seeing as she, as far as we know, was in the Worldcore] by the Old Gods.
But that’s still pure speculation.