Biden made a mistake. He ran on affordibility, emphasising that he brought inflation down steeply, more than other industrial nations. He was correct, but at the market, people were upset by rising prices. Reality went against his claims.
Trump should have learned, if he is capable of learning. But he makes wild claims about how prices are dropping more than they ever did in recorded hitory and beyond. We shop. He does not. I am sure his advisors are telling him to lay off the affordibility claims. But he listens to no one.