He's right though. One of the reasons the US is so technologically dominant is because of the brain drain. Of course there are also employers and employees who abuse and try to game the VISA system. That is also true.
I feel like people are talking over each other. The top 0.1% of talent goes to the US because the US has better growth opportunities and better prospects than any other place on earth. It's not just about sourcing talent. It's also about denying competitors that same talent.
My work got me an Macbook M3. After two weeks of dicking around with it, I went back to my Thinkpad. I don't get it at all. I thought at least the hardware would be great, but I hate the hardware too. Too heavy, aluminum case feels fucking cold to the touch, screen still isn't bright enough to work outside, keyboard has that fucked up layout. And although the M-series sets a nice trend, it currently cannot run GNU/Linux without lots of reverse engineering, so fuck that. My 2014 gen Thinkpad is a far better experience. I'm now even more convinced than ever that Apple is just a marketing cult.