What is TMS?
Transcranial Magnetic Stimulation (TMS) is a safe, effective, non-invasive procedure for those suffering from major depression who have not had satisfactory results from antidepressant medication or do not want to deal with the unwanted side effects.

TMS - for depression
Carbidopa - for PD

Did you mran DBS?
Deep brain stimulation (DBS) is a neurosurgical procedure that uses implanted electrodes and electrical stimulation to treat movement disorders associated with Parkinson’s disease (PD), essential tremor, dystonia and other neurological conditions.

Doctors may use DBS for movement disorders or neuropsychiatric conditions when medications have become less effective or if their side effects interfere with a person’s daily activities.

That is correct

If Carbidopa/Levadopa has no effect you may not have Parkinson’s disease.