I've been a player scout and coach for over 25 years and I have never thought that's true
First accuracy is a very broad term. A better term imo would be precision. and since college Josh has shown the ability to throw a very precise football.
His sideline throws since college have been showing off his precision. Somebody who is naturally inaccurate, would never make those throws
What he was lacking in was consistency and lower body mechanics, which in turn, effected some of his throws when he got lazy
An inaccurate quarterback doesn't make some of the throws that Allen did as a rookie, he was inconsistent do to lower body mechanics which were getting cleaned up last year, and now he has confidence and consistency