Parent comment is implying that an ally (Israel) is performing a holocaust. In fact, there have been a good dozen genocides in the past century which I would agree fit the term, but not the conflict that Israel is involved with.

The anti-Israel and anti-US side typically take an argument or incident from Israeli or US history or culture and invert it. A good example is the common Hebrew expression "No other land" - we have culture and songs about that, as well as jokes and it is a common expression in everyday speech. After October 7th, as part of the propaganda campaigns against Israel, that phrase was used as the title of an anti-Israel movie highlighting that another population has "no other land". Inversion of our culture.

Holocaust inversion - accusing Israel of perpetrating a holocaust - is this particular example.