Redacted content are not blocked in the chatrooms.
Fractal does not censor redacted content, unfortunately I found out about this when someone from Matrix HQ's chatroom posted explicit content which got redacted almost instantly in riot.im. However, the image were never removed or hidden in Fractal.
I think this is a bug since the content should be redacted if the chatroom moderators think it's required. At the very least, there should be an option to manually hide content you don't want to see.
I will obviously not post proof of the issue, but I will post how Riot.im censored the image as an inspiration.