[YuriNiyazov]

Fine distinctions get lost on Twitter, unfortunately. Your points about hiring people in other countries are valid. Remote work is also an alternative to moving everyone in the US to Chicago, NYC, or San Francisco; I understand that PG's essay was about immigration, but PG is an on-going advocate of people working in the same office due to the "great ideas happen in chance meetings, and those are hard to replicate", which means that that only does he want great programmers to move to the USA, he also wants them to move to cities that are tech hubs.