That chart shows the federal reserve assets, not the total supply of dollars. It's a pretty interesting chart, but it doesn't support the statistic you quoted.

The chart for M1 (currency, demand deposits, and other liquid deposits) looks similar: https://fred.stlouisfed.org/series/M1

That's about 30% of all US money supply created in 2020.

I'm sorry, I don't have enough information on what those statistics mean. I'm not sure what that chart measures, but it shows a 4x increase in early 2020 which leads me to think it isn't saying what you think it's saying. While I don't doubt it relates to how the Fed manages the money supply, it doesn't say what you want it to say.

If you are going to sell this point, you need a source that undstands and can break down the subject matter to explain what these charts are measuring and how that relates to the supply of US currency.

The Fed is the only source of Dollars. Banks only produce IOUs.