I find it strange that a message was sent about the turbulence.
Surely, under normal circumstances, one would be doing a whole load of things to try and improve the situation. So why waste time doing something that plainly will NOT improve the situation.
Maybe it was such awful turb that he felt that they might not make it through and that therefore it might be helpful to ensure that some details of the aircrafts plight are known.
Just strikes me as an odd thing to do.