There is no need for a retcon, the new info about the First Ones can easily be integrated with info from the Chronicles.
In the Chronicles it is said that the Universe was created as a result of the clash between Light and Void.
Taking the new info into account, we can speculate that it wasn't just a "generic abstract clash between two forces", but simply a kind of war between factions of First Ones. A faction that followed order (the Light is orderly, pristine, lawful) and a faction that followed chaos (the Void is chaotic, madness-inducing, insidious). The chaotic First Ones then went on to become the Void Lords. Blizzard already recycled Kerrigan so they can recycle Amon and the Xel'naga too.
The Warcraft franchise was a rip-off of Warhammer so it would be poetic if the narrative shifted from Good vs. Evil, Mortals vs. Sargeras, to Order vs. Chaos. As Archbishop Benedictus said, "There is no Good, no Evil, there is only Power".
We see that both Light and Void have their good and evils, BfA makes that clear with Yrel and the Lightbound.
With the Crusade you could make the excuse that they were twisted by a Dreadlord. You can't with the Lightbound. They are undeniably waging war in the name of the Naaru.
People online as usual jump to conclusions. That Chronicles is written from the perspective of the Titans doesn't mean it's non-canon, because the Titans aren't idiots who don't know anything. Rather, it is canon but correct up to a certain point. The Titans might have identified the catalyst for the creation of the Cosmos but not the precise dynamics of it.
So in short I subscribe to the theory that the Void Lords are actually Rebellious First Ones. This would explain why the Void Lords are so almighty and unfathomably strong that they can't even manifest in the physical plane; while both Sargeras and the Janitor can.