Eh, each of FAANG will do exactly that (as will other tech companies!). To be charitable to the parent commenter's point, they probably mean articulate in two senses:

1. Speaking perfect English, both fluently and without a heavy accent.

2. Talking about technical topics or other shibboleths with the same cultural affect an American would, as opposed to a foreigner. For example, many Indians will call a phone screen a "telephonic interview", and I've personally seen Americans react poorly to that.

I know lots of developers who are very well paid and very effective in their jobs, but they don't speak English as well as an American and would stumble at certain cultural nuances.