I don't think people need to spell out supply and demand every time they indicate that increasing the supply of something brings down prices.
In other words: yes, it is obvious.
In other words: yes, it is obvious.
Unless there is an increase in productivity, which if you read the article, would be apparent.
That is increase the labor supply while simultaneously increasing labor productivity and you will see a real drop in demand for laborers which is naturally going to result in a stagnation of wages. That is the extra demand created by the wave of low wage immigrants is more than made up with the increases in productivity in that same time period. Now you have a macro economy much more efficient at concentrating wealth.