To illustrate, imagine that IT workers used to get paid a $100k real wage in 2000 and a $50k real wage today. Imagine computer scientists and programmers got paid a $100k real wage in 2000 and get a $150k real wage today. Bundling them all into IT would lead you to mistakenly conclude that a computer scientist would expect to make as much today as they did 10 years ago.
Can someone confirm this logic is correct?
I don't know what the real stats are, but you haven't provided them. I also notice that the Brookings article you linked states that real wages have increased for those occupations in the past few years, but I don't how if at all they are bundling professions differently.
"Or is the hidden truth quite simply that large supplies of guest workers allow many firms to swap out higher-paid, high-skill domestic workers for lower-paid, high-skill guest workers?"
The Brookings article you cited states the opposite. Foreign workers get paid more. If there truly are enough good programmers and computer scientists available in the states is there a conspiracy to subject oneself to the nightmarish visa system and pay high legal fees to be able to hire foreign workers and pay them more than Americans, all the while not offering high salaries to qualified Americans? What would motivate one to do that other than a shortage of qualified candidates?