I'm highly suspicious of the results, as you should always be when a group with a stated political goal releases a poll that shows their favored political goal is what a politician should do.
You have to think there was bias in the presentation, eg the question was framed particularly softly like "if Kamala announced she would abide by current US law including the Leahy Law suspending arms shipments until there is a ceasefire which would save the lives of civilians on both sides" or whatever....that is all 100% true and consistent with what they're saying, but in real life if she did that she'd get millions of dollars of negative ads framing the decision differently.
Or maybe they just ran the poll 5 times and didn't release the others because this one was the best result for them. That doesn't make it an illegitimate poll, but it makes it more likely that the numbers are the high end of the potential benefit from such a stance.
One other way this poll could be true but misleading is that maybe this declaration brings her from 44% to 49%, but it puts Trump from 40% to 51%. Or whatever. It's possible that with no clarity, she goes from 44% to 52% because you can't literally vote undecided, and the 49% number is actually her doing worse than she would have.