Don’t know for sure but a lot of the apple crop around here (SE Michigan) was damaged by early warm weather and late freezes. Then what survived was subject to a pretty dry summer.
At least when you buy a bag of apples it often has a farm name on it so you know from where it came. As far as applesauce goes who knows where the apples came from. It could be New Zealand or China.
That was going to be my guess. The drought was pretty wide spread.