That video is very convincing.
The Times article via @elfm is unpaywalled here:
https://archive.is/499wE#selection-1215.0-1222.0
The article says, or perhaps one should say “alleges” that:
Since August, alone, Scranton and its sister-facility in nearby Wilkes-Barre have received more than $420 million in federal funding for a new building, additional equipment and improved automation that the Army hopes will boost production rates. The flood of money is a welcome turn for the Scranton plant, which was first constructed in 1908 by the DL&W Railroad as a steam locomotive repair shop. The Army acquired the property in 1951 at the onset of the Korean War and converted the facility to manufacture artillery shells.
Having seen the video I believe the claim.
Clearly the artillery plants that are needed will have to be constructed elsewhere. Somewhere, indeed anywhere that has modern manufacturing plants and foundries and the capacity to build and upgrade them.
South Korea could be a good bet.
Meanwhile perhaps Ukraine should make North Korea a better offer than Russia does.