They said "contributed". There's also third party voters.
I don't buy that you should just vote for the lesser of two evils. Kamala was a shit candidate that I doubt she was ever expected to win. She was such a shit candidate she actually solidified my view that the two parties are colluding to serve corporate/Israeli interests and have the working class point fingers at one another.
Whenever I see an extremely pro party (left or right) comment online I figured there's an 80% chance that it's a propaganda bot and a 20% chance that its an idiot cause in real life everyone I talk to is disillusioned with the two major parties.