They didn't actually declare the genocide claim plausible, but rather the Palestinian's right to be protected from genocide. At least that was the then-president's interpretation -
> “It did not decide - and this is something where I'm correcting what's often said in the media... that the claim of genocide was plausible,” said the judge.
> “It did emphasise in the order that there was a risk of irreparable harm to the Palestinian right to be protected from genocide. But the shorthand that often appears, which is that there's a plausible case of genocide, isn't what the court decided.”
> “It did not decide - and this is something where I'm correcting what's often said in the media... that the claim of genocide was plausible,” said the judge.
> “It did emphasise in the order that there was a risk of irreparable harm to the Palestinian right to be protected from genocide. But the shorthand that often appears, which is that there's a plausible case of genocide, isn't what the court decided.”
https://www.bbc.com/news/articles/c3g9g63jl17o