I do think the burden of proof is on Airbus after their statement. Clearly it aims to restore the 225 to routine service asap.
The rotor pulled off one of their aircraft which killed 13 people, but they give an all clear.
So there must be something substantial that has been found, but not yet released.
Absent some very specific understanding of the cause, it would risk brand killing to issue such a recommendation. Who could trust them again if they are found to be at fault?