The US primaries and the general election are two different things. Voting uncommitted in the primary expresses support for the Palestinian plight and does not give Republicans any ground.
The uncommitted movement presents a safe and effective avenue for voters to voice dissatisfaction with President Biden’s policies, particularly with the Israel-Hamas conflict. By doing so in the primary, voters can signal discontent without risking a Republican victory in the general election. The purpose is to send a wake-up call to the Biden administration that it is failing to address issues and effectively engage with the party, vis a vis that Biden is enabling a genocide.
That being said, anyone who calls for an uncommitted or third-party vote in the general election i will personally kick in the gender neutral balls (in Minecraft).
I saw the 'undecided' crowd (which was a concept that came after criticizing Biden and discouraging voters for months) credited themselves with him making that decision, though I doubt it was the only influence. It's been kind of apparent that political opponents have been using that as an issue against Biden and it is pretty unpopular, not to mention generally wrong, so of course he should change policy. I think they can figure that out themselves too.
Well, if you have figured out a way to stop AIPAC from influencing US politics, great! It's only been about 80 years of sending them billions of dollars in weapons and arms each year. The idea that Americans are going to send their own politicians to international criminal court in the EU is pretty far-fetched. I'd start with Bush, Rice and Cheney personally.