If you went back in time 50 years ago and asked if things like the power grid or resources distribution or the supply chain at the time would be sufficient to handle the current population, the answer would be an obvious "absolutely not." But it did work because our capabilities also increased with population. The assumption of the topic headline is that our current port capabilities and infrastructure will remain the same forever, which is obviously an absurd notion.
“If demand for goods remains elevated in perpetuity, the Ports of Los Angeles and Long Beach will never fully clear the logistical hurdles required to untangle the supply chain,” and “the supply chain will never normalize, barring significant infrastructure investments,” they wrote.
Good thing we just passed a significant infrastructure investment then!