The 2020 numbers aren't fake.
A lot of states sent out mail in ballot applications to every registered voter. A lot of voters who don't normally vote returned them. In some cases it was legal for party workers to go and collect them. The people didn't even have to put the ballot back in the mail. These are states that automatically register people who update their drivers license. But most of these states didn't do the same things in 2024.
The names were real, the addresses were real, the people actually marked the ballots, but they wouldn't have left the house and voted otherwise.
There were at least 10 million people like that and most of them, in 2020, wanted Trump gone. Just like most Americans in general wanted him gone, shown in every poll.

---