Represents the "movement", or represents the sub? They obviously still represented the sub - they were there when it got created, were a moderator, were picked by other moderators to be a representative of the subreddit in media events (which is conflated with the nebulous concept of "the movement")
The issue here is that the "movement" may not be represented by Doreen, but there may not even be a movement outside of the sub, and they do represent the sub. A lot of people treat "the movement" and "the sub" as basically being equivalent. They may actually be equivalent. If the sub shut down, there isn't really any guarantee that the same kind of antiwork internet discourse would be as loud, focused and frequent as it is right at this moment.