Retconning the Timeless Child would require an officially established Canon, which, as I've stressed several times in the past, Doctor Who doesn't have.
Even if RTD never touches on the revelations surrounding the Timeless Child, said revelations will still forever remain a part of the proverbial toybox that is Whovian Lore and therefore available for somebody to take out and play with at their own discretion.
Even if RTD never touches on the revelations surrounding the Timeless Child, said revelations will still forever remain a part of the proverbial toybox that is Whovian Lore and therefore available for somebody to take out and play with at their own discretion.