This trend is a real threat to US national security. You don't get B-21s and radar arrays without top tier academics.
You only need engineers for those. The type of science engineers and other academics do, are very different. The best way to lose top tier engineers is to de-industrialize and flood the market for engineering labour with low cost labour from out of the country.
You also need mathematicians and physicists for cutting edge research.
If he isn't poached by Melbourne we will be able to deduce that Melbourne has been "advised" by an Australian government middleman about threats from "overseas", surely?