With a single word in caps like that, I read it as yelling the word loudly.

The way it’s used here, by a PR conscious intermediary, it comes across more like bitter sarcasm. Like he would not let them release the statement on his behalf unless they yelled Facebook’s name when calling them out. It is similar to when a child tells their sibling they aren’t allowed to do something, but they say it loudly enough so that everybody understands the parent in the next room hears it too.

Edit to clarify: It is an awesome move to call them out, especially to people who blindly just use Meta’s stuff. I read my own comment and worried it would sound like I was calling the Facebook call-out childish itself. It is not. It is a very good thing to fight for a better world, especially when you have the fame or resources that give you a louder voice.