I sat and read the job postings just yesterday! Saw the monitor openings and was just like *sigh* ... but I'm across the country and I sure can't afford to move to LA to be a monitor!
I am a volunteer mod on another type of forum and had an extensive phone interview, plus was on "probation" for I think 3 weeks before I was actually made a real mod. The owner, other mods kinda watched what I did, how I responded to people, when I logged in (we don't have a set schedule), etc. We do have meetings once or twice a month - via yim, more if something big is going on. And a separate mod board just for us.
I think if I remember correctly there's something about state laws re: hiring people in other states to do this type of job. I guess they're not the same for overseas (the Japan monitor job openings).
Back to the original warning and the reason for it. It may not have been an actual monitor. You typing that with the capital letter may have triggered a "filter" or a "bot" (I know - they don't exist, just like jelly world

) Yes, it could have been a monitor - on their own or people could have reported. But if it was like a really fast warning? I'd lean towards something automated. This type of thing is even alluded to in the monitor job opening ads.
And the rules do clearly say no religion or politics. I have seen warnings that make you want to just smack the computer screen - like people getting warnings for telling other people to not post chains, things like that.