They can't do anything of the sort with this move. All this is really doing is subsidize Japanese, Korean, and European ship makers. It's a measure to stop China from gaining a virtual monopoly in the ship building market, for which it will be effective and will lower the market share of Chinese ship building companies, leading to losses.
But like all subsidies, it comes at a cost. If a company was buying from China instead of Japan or Korea, it's for a reason - typically cost or speed of delivery or technology. Distorting this market incentive does not come for "free." It means the company will have to take losses to its operating efficiency in order to supply the US market.
This loss of efficiency will, in turn, result in shipping companies raising prices, which will inevitably be passed to the US consumer, furthering their misery. A classic "captive market" effect.
To prevent China from attaining economic hegemony, the US national security establishment has seen fit to make everyone poorer.
This is expected behavior from the West as it is the nature of white fragility to try and destroy what they cannot own.