> The 2020 inflation was the result of 2019 deficits.
There was no inflation in 2020, the year that COVID hit. Many places experienced a month or two of deflation due to shutdowns. Remember when oil price went negative?
> The 2020 inflation was the result of 2019 deficits. After that, the deficits were due to Biden.
Double check your timeline, Biden did not become president until 2021 so you cannot lay the 2020 deficit on him.
The single highest deficit year was Trump's FY 2020 with a deficit of $3.3 trillion. It came down the next year (FY 2021) which can either be credited to Biden or shared between Biden and Trump since it spans both their terms.