Read my previous post for A "reason" why Trump did this to SNAP.
@builderofcastles/money-does-not-put-food-on-the-table-food-puts-food-on-the-table

However, anything typed about Trump is complete speculation. No one really knows the guy. Many swear that he does things completely randomly, or by the seat of his pants.

About "sales", food items go on sale when there is too much of it in inventory. Soooooo, it could be because of SNAP not buying, but it also could be because some is trying to "feed" the poor. (because it is soup, easy to heat and eat)