Earlier quoted context omitted.
Indeed, it is - which proves the parent's point. This would be an example of something that's both just and coercive.
But this definition is unusual and doesn't bring any insight. It reminds me about psychological egoism, that says that there is no altruism, everything is egoism. Technically correct, but doesn't help to explain altruism-behavior.
Now take property, property is coercive because if you refuse to follow property law then the government enacts violence against you.
It's one to one.