Trump 2024 won 49.8% of the vote versus Harris' 48.3%, out of the 65.3% of eligible voters who voted (about 154 million of 174 million people.)
Trump's exact vote tally was 77,284,118. That many people voted for him, versus 74,999,166 for Harris (with Trump's margin of victory being 2,284,952 votes.)
There are approximately 300 million Americans. So even though Trump "won the popular vote" it it still correct that most Americans didn't vote for Trump. Not even more than half of voters voted for Trump. Trump having "won the popular vote" does not in any way mean that a majority of Americans or even voters supported him, that just isn't the way the system works.