Bear in mind ACARS overland is typically crude VHF unencrypted data transfer, which spotters / ham radio types can receive
AFAIK? So if anything dramatic was sent, somebody might have said?
I would think the BEA will prioritise what they do have in conventional data sources (CVR, FDR, Mode S, ADS-B, ATC etc.). AF447 resorted to ACARS due to a high level of integration, and absence of other sources...
LH a/c do send only very limited operational ACARS data due to a major disagreement with the pilot's union. Data are considered as personal and performance data of the flight crew that the employer may not have access to without proper request and worker's council approval.
All LH ACARS messages are encrypted.