I love that the worldiverse let this kind of shit on for 3 days and then they whine about tankie censorship.
"From the river to the sea, palestine will be free" is calling for (as the word says) freedom for palestine. The fact you think it implies killing people just shows that you cannot imagine israelis not oppressing palestinians.
It's not calling for anybody's displacement. It's calling for freedom for the palestinian people. Period.
There will need to be an agrarian reform at some point but that need to happen democratically.