This is where the reading part comes in. They didn't say "eligible registered voters" they said "voting-eligible population" 213.8 is the number of eligible registered voters; the voting-eligible population is 239.2 million. 66.2% of that is about 158.35 million. <<< The reading, the math.
You aren't giving any evidence that the fact-checking website is wrong, other than that it disagrees with your preconceptions, so I don't feel that I need to address that.