Correct, in which case, it seems like a manufactured outrage. These folks are already in the US and authorized to work here for up to 6 years - basically indefinitely if applying for a green card.

Also from where is the article getting that they're low paid? Its paywalled. If you see their filings the salaries are on par.

You can’t really refute the claim that H-1B drives down the market price of labor by citing their price in the market. You have to show those wages would be the same even without the immigrant workers. From a basic supply and demand perspective that sounds unlikely, but markets are complex dynamic creatures so perhaps it’s the case. Nevertheless it needs to be shown.

Similarly, it is very challenging to demonstrate this claim. It does not seem like the sort of thing we should take as a given.

Agreed, markets are complex. And frankly I don't find market based arguments for or against immigration particularly compelling for that reason. So far as I can tell we really have no reason to believe either side's claims along that dimension.