This would seem to be extremely unethical to me. Well it would be a whole list of other things too (paternalistic and dishonest, to name a couple), but unethical would be my starting place. What would ever give a therapist the right to treat problems if the client did not consent to be treated for those problems. Not to mention if it is not a problem for the client, then what give the therapist a right to label it as such and treat it unbeknownst to the client? A horrible horrible situation in my opinion.