HE rightly points out that higher education is to blame for the shortage. So called "higher" education is focused on the Marxist application of the soft sciences of the 'humanities'. Because they have failed the American people and their student, we now have a shortage of qualified and talented engineers to meet his needs. Hence the support of getting talent from outside our bordres.
He is not alone in this.
The right has been pushing for a couple of decades to get out of the Marx model and into a STEM model. A STEM model benefits the country and its people far more than the Marx model.