RTD does add some fuel to the idea of the Timeless Child being a trick of some kind
That's one interpretation of things, but runs counter to RTD's tacit acknowledgment, both in-universe and out-of-universe, of the veracity and currently binding nature of the Timeless Child lore as an origin for The Doctor.
I wonder if this could explain the fugitive doctor
The Forgotten/Fugitive Doctor has already been explained; she's a Doctor who predates the First Doctor.