I was taken very much aback when the French held a press conference before even the FDR was found and declared they knew what happened. That is just not how ANY accident investigation is done, nor are the police or state lawyers the people to communicate this.
You may think and wish that but FWIW the French system often appoints an examining magistrate with serious powers immediately very very quickly after any fatal accidents, road, rail, sea or air, and they can and do sometimes talk to the press.
I saw the said press conference and whilst you are right, the some of the comments were surprising and yes, the FDR hadn't been found or read at that stage the conclusions that had already been drawn at that stage from ADS data seem to have stood the test of the subsequent investigation by the technical teams involved in the investigation over the next several months.