Doubt it is all true but the part about Clara going back in the Doctors Timeline to save him makes sense, she dies so he lives but what doesn't make sense is if Clara from the Asylum and Clara from the Snowmen are just Clara from episode 1 - 4 so far, how come she doesn't know the Doctor when he turns up in the Asylum and Snowmen?
Afterall, if she is just current Clara (the original but from the future once she begins to save the Doctor) she would know who he is when they meet. The only time she wouldn't know him is in TBOSJ because that is the beginning of the timeline.
I hope that makes sense lol The plan does seem plausible but it does have plot holes....mind you we still don't know who blew up the TARDIS do we?