You're just explaining how physical forces as currently understood don't allow faster-than-light travel. You don't need an argument like the one in the article

You're just explaining how physical forces as currently understood don't allow faster-than-light travel. You don't need an argument like the one in the article that involves causality violations to show that - it's just a consequence of the currently-understood laws of physics. None of this tells you whether faster-than-light travel or communication might be possible using some as-yet-undiscovered force obeying yet-to-be-discovered laws of physics.