Doctor Who: Flux - 15 Huge Details We Just Learned About Series 13
11. ...But It Also Has Ties To The Timeless Child Reveal
Given how monumental it was, it's long been assumed that the ramifications of the Timeless Child reveal would be felt in Series 13, even in just a small way.
Whittaker and Strevens also touched on this, confirming that, yes, everything the Doctor learned at the end of Series 12 will come into play in Series 13:
"From where we’ve left her, I think self-discovery is the biggest journey the Doctor goes on this series... it picks up on a lot of the things the Doctor learned about herself and her history at the end of series twelve."
There are theories that the Flux is a time-bending event that has messed up the Doctor's history, which explains where the Timeless Child backstory came from.
But while the twist is definitely more disliked than beloved (and for the record, this particular writer falls in the former camp), Whittaker/Strevens' comments gives us the impression that Series 13 will build on the Timeless Child story, not wave it away.