@sozobe,
I think Craven explained somewhere that in the new system, incorrect tags are to be crowded out with correct ones, not removed. (That's why this one still comes up in health.) For example, if one user has this thread tagged under "health", and ten have it tagged under "forum help" , "tags", "new A2K", or some other tags that make sense, it won't show up prominently under "health" anymore.
Disclaimer: That's the idea as I understand it, but I haven't yet finished getting the hang of it myself. So take this with a grain of salt.