This is true, i read the letter that was sent to my wife and it states that medical results will be mailed to CIC Delhi office and from there the results of the medical will be send to the CIC Isb office. It sounds strange but that's what they do. I heard ISB office has a real shortage of man power and this is a way of distributing some work to take off the load.
My wife got her remed in Isb on March 20 and send the passport the same day with the medical receipt. However, when she called 3 days later to the medical centre to find out if the results were mailed, the receptionist said they will be mailed by end of the week. After a little argument with the receptionist, it was assured that documents will be mailed next day. Anyways, she called again next day and the receptionist informed that the doc signed the medical form and results were dispatched. Was she telling the truth or lying, GOD knows, but I can hope that she was telling the truth.