The question should be “where did those 20 million voters come from”...
That’s easy. A good percentage of the dem’s beasts of burden ( only a few dozen people at best ) who delivered those votes in 2020 were POd by the Harris bait and switch the party pulled. They were 100% for Biden and showed it the only way they could. Was Harris’ people expecting the fake votes this time? Yes. Would those votes been there if Biden stayed the candidate? We’ll never know nor do I care.