Incidentally, if I were in V's position and knew about Time-Turners

I realized this morning that I should be clearer: obviously, V knows that Time-Turners exist. But does he know enough about their function to know exactly how the information-backpropagation prevention works, and which loops you can reliably create, and which ones you can't? That seems like the sort of thing that would require extensive experimentation that he may or may not have done.