Actually it’s not 150 million. It’s 133 million registered voters minus Trump’s 74 million leaves only 59 million for Biden to have received. Biden won the least number of counties in history.
There were 153 million registered voters in the 2018 election. I’m sure there were more than that for 2020.
https://www2.census.gov/programs-surveys/cps/tables/p20/583/table02_1.xlsx