You are correct. As mentioned in the interview -- the Wilmington port director made it very clear the volume of shipping from Asia is much lower to the east coast than the west coast. In fact it is cheaper to ship from Asia to the west coast and then transport the goods across the U.S. by track/rail/etc. then to ship to the east coast from Asia generally. The interview also listed out volume from Asian countries (all which have problems now) but China was much larger than the others in terms of the goods being shipped.
The shipping rates have skyrocketed all over -- with the largest increases being related to Asian exports of course. The shipping rate increases are not just limited to Asian trade.
BTW --- the ports of Charleston, Savannah, and Wilmington still have available capacity for shipping, unloading, etc. -- the crux of the interview was if more ships from Asia may come to these Southern U.S. ports due to the crisis on the west coast. Interestingly enough the answer is "No" -- most Asian shipping will stick with the west coast despite the delays. It should be noted that these Southern ports -- many which recently upgraded their facilities --
are hitting records recently in containers unloaded but they were underutilized to start with.