It is not Antisemitic to suggest that othr victims of the Holocaust should share Holocaust Day, b#y any stretch of the imagination

No. She was just ignorant of the fact that they do share Holocaust day.
Walker had just not bothered to check that her beliefs and prejudice were just anti-Jewish propaganda.

To suggest that other victims can't is Apartheid beyond the grave and a conformation of everything that has gone wrong with Israel

It would be if it was true, but it is just lying propaganda. Holocaust Day DOES encompass all acts of genocide since WW2.

It is indecently grotesque to exclude victims from such an event

It would be, but it is not true. It is just lying anti-Jewish propaganda