Yes, you need to wait,移民顧問是對的

I saw a lot of people get a letter saying their cases have been transferred, an interview is required, etc.

After that, people need to wait till the official interview notice. Buffalo decides if you need interview or not, but the actual interview date is determined by the specific conculate. So you need to wait till the official notice with actual interview date come. This has nothing to do with medicals.