From the article;

>The United States can also boost retention of tech talent by granting immediate permanent residency to every foreign-born doctoral graduate in the STEM subjects.

i.e. If you get a PhD in STEM in the US, you should get a "Green Card" along with the degree.

This is such a obvious low-effort thing to implement and will pay such enormous dividends that it is hard to fathom the stupidity behind its non-implementation.