Well, that's what's supposed to happen. If by magic an object happens to travel FTL, then the object arrives at its destination before its destination can observe the object actually leaving. This is essentially a negative delay. The entire thing is moot anyways since it can't exactly happen in the first place, so it's not really clear how the universe would experience FTL in the first place.
No. That is not a negative delay. That is just getting somewhere faster than perception. You never hear the gunshot that kills you because the bullet arrives before the sound.
A negative delay allows you to go somewhere, get there before you left and come back and stop yourself from leaving before you do. That might, or might not happen if you managed to change speed without accelerating. We don't know because the only way to change speed we know if is to accelerate.
If you allow the conceit that FTL travel will be possible, you have to be able to either bypass the intervening space so you don't have to accelerate all that much, or you have to change speed without accelerating. Since in reality we can not change speed without accelerating, all bets are off on how magic will make it work.
I am sorry, I may be argumentative today for some reason.