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Facebook has a program where a majority of new hires go through to learn about their tech stack and contribute to a variety of teams. It's also where you find a team to join.

Basically a high powered onboarding program that is really good.

Recent hires who haven't yet been allocated to a team, though they do work with teams on real tasks and produce code. Usually non-specialists, though some like ML engineers do go through bootcamp.

People without any formal higher education, but only coding bootcamp experience.

Not in this context.

to be fair, the non-facebook definition is way more commonly used in tech.

I wouldn't say that. At least, I haven't talked to many FB employees and yet bootcamp was used for onboarding at two largish tech companies I worked at.

I've never really heard of it being used that way before now

That was my assumption too before seeing the clarification