The announcement says they are upping production by 200,000 to 500,000 cars per year. This a likely a true statement. Also true is that these are electric vehicles. If the push is for this country is to remain on petroleum, then where are these cars going to be marketed? Had the infrastructure initiative created by the Biden administration not been gutted it would be easier to accept the idea that there would be an increased demand for EVs. Who will buy these cars? What country will they be exported to? Will cheap American made junk become the new cheap Chinese junk?
Edit - the OP does answer these questions. Sold in South Korea, the US, and Europe. So yes, we have become a new source of cheap labor. South Korea manufacturing vehicles here to be shipped back back to South Korea and sold.

But did add an edit. Tx

I have seen a lot of new Hyundai EV's on the road where I live in Oregon. Particularly a lot of Ioniq 5's and Ioniq 6's.

"Hyundai is manufacturing EVs in the US at its Metaplant America (HMGMA) in Georgia, which will be sold to US customers. The plant's annual production capacity will reach 500,000 hybrid and EV models by 2028, with a significant investment of $2.7 billion to increase production and create jobs, supporting the strategy to make over 80% of Hyundai's vehicles sold in the US domestically by 2030"

We disrupt construction on the facility. The American people are steered into dislike and distrust of EVs (who would rather be eaten by a shark than electrocuted). And the result is they increase production by another 67%?
I just don't get it.

Electricity is still mostly made from fossil fuels. Green energy sources are mostly filling expanding demand they are only beginning to displace more conventional energy sources. The subisdies have helped get these a foothold. The demand for them will continue as they get more miles to the gasoline equilivalent. Toyota's prius is a full electric car with its gas engine setup as a generator. The modern Prius drivetrain is electric.

Unless they are looking to cut a lot of costs with minimum wage jobs, absence of safety/environmental reg enforcement. Even then I can't see how the US would be cheaper than China (or closer). This is either sunk cost fallacy, or Hyundai is promising big production numbers it won't deliver, and will delay actual production due to a labor "shortage" and is hoping to wait until the next admin to bring back incentives and green-friendly policy. Another answer would be they are paying Trump a bribe, but I don't know if he can be trusted to stay bought, or has enough remaining cognition to remember he was bought.

The low wage workers could very easily be the greatest proportion of their factory workforce as automation and AI can be easily be used in production analysis and material acquisition and handling. Barely any skilled labor would be needed.
As far as being cheaper than China, let me move the goalposts here and say cheaper than South Korea. Why else would South Korea choose to manufacture their own product abroad and then import it? Obviously the cost of production here is significantly lower than the costs there if what we can make a car for, plus the costs of shipping, is less than their own domestic production. Essential we would be to them what historically China has been to us.
And no one can discount how many monkeys with typewriters are in the current administration, an open variable.

what I want to know is: what did he give away, behind the scenes, to save face.

he's a master as something but it ain't negotiating.