How could that possibly be true when the only people perpetuating this word are groups like the ADL, Israel... If what you said was true, all of these Zionist institutions wouldn't be promoting it.
I checked wikipedia, and actually it states the same as the parent comment. That sentence has five references. It doesn't shock me, given the era, but rather than speculate and squabble, someone could check the references and see if they really do support the statement in the wiki.
I assume hardly anyone remembered, or payed much mind, to the origin of that word by the 1920s. I don't know who coined 'homophobia' or 'feminism' or many other concepts; they're just common words we use.
And I would complain about the false accusation if that was the case. As it stands "antisemitism" is what's being used to label people who oppose Zionism. It's just like how "communism" was used during McCarthyism.
I can promise you that "the ADL and Israel and the Zionist institutions" are not the only ones using the term "antisemitism". I'd personally prefer that it'd be called anti Jewish racism.