As BadEmpanada put it: "They're trying to give the judges an out to throw the case on ideological lines before it even starts, they're not arguing the facts because if they did they would lose badly" Basically all they did was gesture to any countries built on genocide that "hey if this case is allowed to go to trial we'll lose and it will set precedent which will come after you next" giving them plausible deniability to stop the trial on a technicality. See they're not voting FOR genocide, they're voting AGAINST the trial.

Basically they're banking on the fact that enough nations are as fascist and corrupt enough as to stop the whole thing before the facts are put on the table, in which case they instantly lose because they literally bragged that they were intentionally doing a genocide. It's in the public record, completely indisputable. They thought they were untouchable and smugly ran their mouths thousands of times, now it's catching up to them.