“Antisemitism” is technically a BS word, just like the “Semitism” word it comes from. It was invented in the 1800s by some proto-Nazis, adopted in the 1900s by Nazis after the concept was already debunked, and continued in the 2000s by neo-Nazis.
BS or not the racist extremists, from what you tell us, made up the word Semitism so surely that warrants legitimate pushback with the term Antisemitism?