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!