Again, context. There is a difference between hitting a target and knowing where that target should be. Both have an impact on "accuracy," though...Luke Falk is considered accurate because he is a great anticipatory thrower, for example. But it was clear that all things being equal he cant hit the broad side of a barn, especially at distance.
And I am pretty sure there is a defense at the senior bowl. Those scouting reports said Josh Allen doesn't have touch, but at the senior bowl he made a perfect bucket throw for a TD.
Yes, you have to project a guy like Josh Allen. That's the NFL front office guys job...But it's not like he came out of nowhere. He's been on the radar for two years despite the fact that he was playing at a garbage school. If he really was as inaccurate as you claim, there's no way that happens.