Btw, hate crimes against Arabs are also antisemitism, as by definition both Jews and Arabs are Semites, so I’m not sure how useful this word is in the context of the current conflict.

This is just wrong. Antisemitism has alway exclusively meant hating Jews.

Due to the root word Semite, the term is prone to being invoked as a misnomer by those who interpret it as referring to racist hatred directed at all “Semitic people” (i.e., those who speak Semitic languages, such as Arabs, Assyrians, and Arameans). This usage is erroneous; the compound word antisemitismus (lit. ‘antisemitism’) was first used in print in Germany in 1879[17] as a “scientific-sounding term” for Judenhass (lit. ‘Jew-hatred’),[18][19][20][21][22] and it has since been used to refer to anti-Jewish sentiment alone.[18][23][24]

https://en.wikipedia.org/wiki/Antisemitism