I'll believe it when I see it to be honest. I'm sure Xavi will be given a lot of input on transfers, but I would imagine that they need to be prioritized, and a cheap youngster seems less important to me than some other moves they need to make. Barca had two of the top young right backs in the world in Dest and Emerson, and recently sold Emerson to Spurs. I know Xavi wasn't in charge then, but the club clearly made a call on who was part of the future and who was not. Dani Alves is coming in but he can't be looked at as any sort of every week player at this point. I think most people envision this more as a mentorship for Dest.
That being said, Barca's financial difficulties are pretty well known. Dest can be sold at a pretty decent profit. Because of his wages, he's probably one of the few non La Masia players that can be moved at all for a profit. Xavi has made it clear he wants to focus on players from the Barca system, so I would guess any La Masia product with any promise will not be sold. It's pennies though compared to the debt owed, so I'm not sure it makes sense. Barcelona's larger financial issue isn't the debt necessarily, it's the wages, and Dest is one of the lower paid players. Moving some of the overpaid wingers and MF to make room for La Masia youngsters seems like a better bet to me.
Of course, Barca's transfers for the better part of the last decade make basically no sense anyways. So who knows.