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I saw a video of Brock Purdy's trainer on YouTube speaking to how he actually improved the velocity on his throws by 5 MPH since leaving Iowa State. We hear a lot about Pitchers increasing their velocity with biomechanics training, but the speed gun isn't used to judge QBs like it is Pitchers.
Consequently, we don't hear about QBs increasing the velocity of their football throwing very much. Instead, the QB is observed throwing in college, and however strong the arm demonstrates it is, that's considered what it is. So one of the most fascinating things about this interview with Purdy's trainer was that he said it's rare that velocity increases at all after a QB is in High School. It might be that this is because there is a difference between what is considered throwing mechanics for accuracy and whatever subtle changes are needed to generate additional velocity.
In any case, it is an objective reality that Brock Purdy now throws the ball with more velocity than he did when NFL scouts evaluated his college performance. It stands to reason that if he threw the ball in college like he is throwing it now he well could have been drafted higher, and not by the Niners. Is Purdy going to throw the ball as hard as Lance? Probably not, but as Joe Montana demonstrated, quick feet, decision making, and accuracy are all more important traits than arm strength.