It doesn't seem to fit the definition of astroturfing. [1]

>Astroturfing is the practice of masking the sponsors of a message or organization (e.g., political, advertising, religious or public relations) to make it appear as though it originates from and is supported by a grassroots participant(s).

Are they concealing the source of the messages? It seems like they are just adding more people who have the authority to remove content that violates the TOS.

[1] https://en.wikipedia.org/wiki/Astroturfing

Astroturfing is building opinions by faking or artificially mis-weighting some opinions, like using fake accounts on social networks to vote and contribute with a particular sentiment, making it look like more people feel that way than actually do.

What Facebook does is to allow and disallow certain types of content based on public guidelines. Even if those rules are nonsense, unfair or politically motivated, it's at least not done secretly unlike real astroturfing.

Depends what they remove, and how they remove it.