I think, in fairness to DCA, they probably are not aware that they are not approved (and never have been).
Whilst BillieBob is 100% in his/her posting - there's a also a certain amount of pedantry in it.
It's true that DCA have never been approved - but it's equally true that there was a time when you could do approved training at DCA. Is there a difference - technically, yes (a big one).
Bottom line is that you can no longer do approved training at DCA (other than PPL) - but DCA themselves may not be aware of that (yet - they will be shortly after my next telephone call).
Indeed, DCA telephoned me today to ask if I would go up there for two months, or so, and teach the remaining students (the ones who have been caught in all the mess of the DCA/AFT contract nightmare).
They (DCA) still believe that they can still conduct CPL training.
Maybe somebody should explain all this technically pedantic stuff in words of one syllable.