No it doesn’t help the proletariat, it only changes who the oppressor is and arguably only makes it easier and cheaper in the long run for foreign imperial powers to economically exploit them.

This article honestly sums it up better than I ever could and isn’t too long, I’d recommend giving it a read.

Also, national liberation would simply not work in Palestine - after all, do you really believe that if Palestinians came out furiously waving their flags one morning, it’d make Israel (which is another national liberation state btw) feel bad and stop their genocide and settling?