I don't think the author is talking about _that_ kind of remote. A lot of companies have dev offices in India, while they sell in US primarily. Nutanix, Ruberik, SumoLogic come to mind.
Author is talking more about office less companies like GitLab, Automattic.
@OP FWIW, I know a friend of friend who worked at Automattic and GitLab had a couple devs from India last time I checked. (But from their salary calculator, it seems GitLab pays much below Indian market salaries)