Putting aside the question as to whether this is even L”H, there’s no prohibition against L”H on someone who is deceased.
I’d be interested in your source.
As I posted I think on the other carlbach thread the ??? ???? did not seem to think that is true
????? ???? ??? ??? ? ???? ?
??? ??? ????? ????? ????? ?? ????? ?”? ????. ????? ?????? ??? ???? ???? ??????? ??? ?????? ?? ?? ?? ?????. ???’
So I am not sure where you are coming from. But please be careful before making such a blanket statement