Of course a new mill trains people on its specific equipment and processes.The newer technology requires training. You do not plug new workers into old systems. New machinery, new tech require retraining and constant training.
The region already has welders, electricians, machinists, millwrights, maintenance techs, operators, engineers, and people who actually know how industrial plants work.
And whatever preconceived picture you have of Iowa as some isolated cornfield is just silly. This site is roughly 2–2½ hours from Chicago, within reach of Minneapolis, and sits in the middle of a long-established manufacturing belt running through Waterloo, the Quad Cities, Peoria, and beyond.
They’re not building a steel mill on Mars. They’re building it in one of the most industrially experienced parts of the Midwest.