The Jones Act (officially Merchant Marine Act of 1920) is not a tariff, so the argument that tariffs killed American shipbuilding doesn't ring true. What it does demonstrate is that protectionism, in the form of straight up import/export restrictions, has unintended consequences (see e.g. DeepSeek using H800s in place of export-restricted H100s) that may harm the interests it is intended to help.

This is a poorly written argument. I found this essay by By Michael Every of Rabobank that explains from a geo-political perspective what is happening. Worth exploring!

"Hoot Small-ly and Reverse Nixon Again"