An updated version of that is the comments section for online stories.
XCheck isn't really about content moderation, it is about special security for specific people and how that interacts with posting.
XCheck is all about content moderation, in particular about saving work (ie money) on content moderation.
The article you linked doesn't say how much fb pays for their moderation. It doesn't say how many people are in their "moderation army". Nor does it say anything current. That article was written 8 years ago.
> XCheck isn't really about content moderation, it is about special security for specific people and how that interacts with posting.
According to the description, xcheck is all about content moderation - it chooses when not to moderate content.