His article says:
Another fellow leftwinger, Kate Osamor – again, a Black female MP – was suspended for describing the assault on Gaza as a genocide on the day the international court of justice placed Israel on trial for alleged genocide. Questions of racism, then, seem to be judged on whether they have a factional use – a sure sign of moral bankruptcy. This leadership style is crude in opposition; with an overwhelming majority, it will be chilling.
But if you go to the linked article you find that Osamor was suspended "for saying Gaza should be remembered as a genocide on Holocaust Memorial Day." She said: "She also wrote that there was an ‘“international duty” to remember the victims of the Holocaust as well as “more recent genocides in Cambodia, Rwanda, Bosnia and now Gaza”."
She chose Holocaust Memorial Day to say that. Rather different to the way Jones described it.