From a purely economic standpoint, ignoring party policies and social insanity, it is actually centrist.

Regardless of your other beliefs, it is purely observable fact that labor works on supply and demand principles, and immigration reduces wages and unbalances this in favor of corporations. If you explain this in terms of workers rights it could technically be a democrat argument (and was a few decades ago) but the modern left trades in denying reality.

Restricting immigration when we are having a declining middle class, when we have no shortage of labor and our economy is going to shit is an obvious action with no actual functional arguments against it, ignoring ideological ones. If we had an enormous demand for labor and no supply and that was hampering economic activity, then opening immigration again could be a centrist policy.