Correlation doesn't equal causation. Just because Biden is in office doesn't mean inflation is because of him.
But here's what we DO know:
Quantitative Easing and interest rate control directly affect the economy for better or for worse. He also kept gas prices artificially low. We can argue if that was good are bad but we can't use gas prices to determine the health of our economy.
If abused, QE and low rates result in short term gain and long term damage. We often times don't see the results until years after the actions have been made and the market has had an opportunity to adjust the new dollar value. Basically crazy inflation equals crazy booms and crazy busts.
Trump pushed QE and near %0 interest rates harder than any president in history. Even Jerome Powell was uncomfortable and pressured into inserting more dollars into the economy. Yikes.
Remember the bust and miraculous recovery in the stock market we had during Trump? Busts like that don't happen for no reason. Nor do recoveries like that normally happen. Our economy was being fed cheap money until the day he left office. Now we're paying the price.