plausible: (of an argument or statement) seeming reasonable or probable

From a court, what that is saying is that the argument brought in front of it is reasonable enough for the court to take action to prevent harm within their power. It’s very different from an actual ruling, which comes later. There was a lot of criticism of South Africa’s case, that it was weak and grandstanding. Likewise, there was criticism of the ICJ for using the wording plausible genocide when many people would rely on that to accuse Israel of genocide without a full ruling.