That's not at all what they said. There was no such finding. It says so right in the article you cite:

PWH: Does this ruling confirm the accusation that Israel is committing genocide in Gaza?

Burke-White: No. In fact, this ruling could never have done so, because though this decision is binding, it is merely the first step in a much longer judicial process that is expected to take years to complete. This initial decision was in response to South Africa’s request for provisional measures and does not represent a final ruling in the case. Cases before the ICJ are long, often taking many years. But in circumstances of extreme urgency where the rights of either party may be irreparably harmed while the case is under consideration, the Court can order countries to take actions that “preserve the respective rights of either party.” Such provisional measures do not involve an actual decision on the merits of the case and hence could never confirm the accusation that Israel is committing genocide.

The Court also took a very cautious approach to this case and was careful not to suggest that Israel is committing genocide.

BTW, why no mention of the finding and order against Hamas? Being an anti-Israel Hamas supporter does not allow one to evade the truth or misquote the ICJ.