I would hold my breath on the validity of the ACARS data. It has neither been confirmed by Egyptair or Airbus, the two parties who surely must have been aware of its existence were it genuine for two days now. There is nothing damning for either party in the contents, and releasing or at least acknowledging it would have given a credibility boost to other official statements, indicating that they really tell what they know. I see no good reason why especially Egyptair would want to reject this relatively positive
PR opportunity at this very difficult time. Unless of course there is no such ACARS data, and somebody made it up... It is now all over the mainstream press, quoting AVH (though CNN seems to have obtained it independently from same unnamed source, which if genuine can only be from MS or AB).