You don't need someone's consent to record in public, and if any of the employees objected to the publication of the recording, they could consult with an attorney about a portrait rights claim. Such a claim should be adjudicated by a court, not Facebook.
And let's be clear about the context here: these types of glasses are used by "content creators" to do street interviews that are published online, and they're also used to record all sorts of junk/nonsense ("pranks", pickup artist BS, etc.).
Meta doesn't seem to have a problem with content recorded with these glasses being posted on its platforms, even when it's objectionable, because it's literally everywhere. The only problem here, obviously, was that he was recording Meta employees.