It looks like this was a fairly recent flagging, so you might still receive an email with a notification. It is generally difficult for them to time flagging thousands of accounts at the exact same time as the same number of receives the email letting them know. 
As for access to the forum, the flagging might not have gone through just yet, but can you try logging out and back into the forums again to check if that updates your status?
I know you did it once, but I want to make sure nothing recent changed your status. Maybe try private/incognito mode on your browser to ensure no old cookies cause an issue.