OK, well, "all lives matter" doesn't mean "black lives don't matter" BUT we all know what they actually mean. It's called a dogwhistle. "from the river to the season" is also a dogwhistle, because the term comes from Palestinian organizations and people that want to wipe Israel off the map. You COULD just say "one-state" but that doesn't have the fun wink-wink that a dogwhistle has.