The Roman solute was not even a term until 1784, and it was still seen as a fascist statement. So no, it’s not some call back to the Romans, and why would it be? Throwing his heart out is the most pitiful excuse I’ve heard. Your heart is not right below your left shoulder, and you don’t put your hand out flat if you’re throwing something. It’s a Seig Heil solute, Führer wave, Nazi solute, or whatever else you want to call it. It’s a fascist gesture, and it always has been.