Dak has always had good arm strength, and his accuracy issues were caused by technical and footwork problems, which means they could be fixed.
Anyone who at any time ever said Dak didn't have a good arm is a complete dolt and should really pick a different sport to watch. It was in his scouting reports and has been wildly apparent from the start that Dak has a good arm. Claiming he didn't in the face of factual evidence that he does is beyond stupid.