Ok I understood now that you don't know it surely, you are just speculating and assuming that you can send empty form as you think they will think it was sent by error.. thanks..When you enter the zoom link and you enter the seat numbers and cut the PR cards- they come to know that you have applied as a family and even before that they know how many members and what not.
So when you don't send the oath form- They already know and if you do, they will think it was sent by error, just my thoughts!