Having skilled workers in an economy is a matter of having a skills pipeline that takes about 20 years to build. It starts by making industries exciting places for school leavers to think about their education, the accessible training programs and university places where they can learn to do it, and of course, somewhere to work. Now, the government is stepping in and creating the demand for those jobs. Good union & education policy should be getting people in those university places.
This isn't just a "sit in a class and learn" thing. While the American workers are being trained the plant will haemorrhage money as yields are bad. This kind of shortsightedness is a classic rent-seeking strategy by unions. But that's normal, union leaders are always fighting the last war. Additionally, they serve present workers, not people who could be workers.
After all, employers would rather choose local workers since they're way easier to get. The problem is that you need to run the plant effectively. You can't do that with a 100% untrained workforce. You need a skilled workforce that you can then augment locally as you scale. You need to build the pipeline, but that takes time and you need to be alive during that time to succeed.
This kind of "it's the filthy capitalists" is just that brand of online ranting that has always been popular. It's not interesting because it barely attempts to look at causes. Filthy capitalists would rather make money than spend 3x as much and take 2x as long to build a plant. Time is money. Especially literal now with high interest rates.