[SantalBlush]

>However it's not because an influx of workers doesn't create downward pressure on wages. It's because there's other factors which keep wages rising.

So one of the main theories about that paper is that the immigrants were in a largely separate labor market in terms of skills/experience from local workers. When they raised the labor supply in their particular market, it increased entreprenurial activity and more labor was hired across many labor markets as a result.