If they spent any appreciable amount of time replying to people and not just themselves, their X impressions would be considerably larger. X themselves has been clear that engagement weights impressions/recommendations/algorithmic display, and EFF has done none of that.
It looks to me like a people at EFF problem, not an X problem.
Also, I don’t think the kind of engagement X’s algorithms reward would be good for the EFF’s image as a serious organization.