It is not because of Biden/Harris. Trump will not make it better, in fact he will make it much, much worse.
That is the point. General public either does not understand or does not want to understand the nuances. That is the unfortunate situation we are in. To them, they are unable to afford stuff, Biden is the president, so he is to blame. And Trump capitalized on it completely.
Politics is largely not a logical game, it is an emotional/knee-jerk-reaction game. If it was logical, nobody would ever vote for people like Cruz, Trump, Boebert etc.
Trump will likely make it better by making the gas price hold at below $3 per gallon like it was for nearly all of his Presidency. This will reduce the price of food.