That paragraph was in reference to zeroing out your velocity before re-entry. The Falcon 9, iiuc, uses a combination of thrust and aerodynamic forces to slow itself down &#x2F; put itself on the correct trajectory.<p>It&#x27;s also worth noting that they only land the first stage, there&#x27;s an entire next stage which isn&#x27;t reusable which adds further speed to achieve full orbital velocity.