Yeah, nothing gets taken down unless reported or if it somehow gets on their radar.
Moreover, they generally send an email with the particular panel that made it get flagged. Happened to me.
Buuut, I didn't do anything about it. Figured out it was flagged a month after the email was sent, but said episode was up again. So I can assume someone else took another look, realized my panel wasn't mature, and put it back up.
If you found out about the flagging through someone else, I would suggest finding the email about the flag and see which panel they said was mature (if they sent one).