If this is correct:

https://worldpopulationreview.com/state-rankings/number-of-registered-voters-by-state

and this is correct

https://www.statista.com/statistics/1184621/presidential-election-voter-turnout-rate-state/ As of December 7, 2020, 66.7 percent of the eligible voting population in the United States voted in the 2020 presidential election.

then it follows that with 212 Million registered voters in the US and 66.2% voting,140.344 M voted.

Now if Trump got 74 M, that leaves only 66.344 M for Biden.

Why does CFR claim instead in https://www.cfr.org/blog/2020-election-numbers

The Popular Vote

Biden won 81,283,098 votes, or 51.3 percent of the votes cast. He is the first U.S. presidential candidate to have won more than 80 million votes. Trump won 74,222,957 votes, or 46.8 percent of the votes cast. That’s more votes than any other presidential candidate has ever won, with the exception of Biden.

More than 159 million Americans voted in 2020: 159,633,396 to be exact. That’s the largest total voter turnout in U.S. history and the first time more than 140 million people voted. Voter turnout in 2020 was the highest in 120 years when measured as a percentage of the voting-eligible population: 66.7 percent.

So since both sources agree at the voter turnout percentage (around 67%) it is the number of the registered voters that matter.

CFR make claims but do not provide evidence of the source of their data.

What am I missing?