Nobody who was paying attention thought he would be a one term president. He said nothing of the sort because that was never his plan. He literally said so at the time:
I don’t have plans on one term
And his campaign emphasized the same thing at the time:
Lots of chatter out there on this so just want to be crystal clear: this is not a conversation our campaign is having and not something VP Biden is thinking about
This is not a conversation we are having among people who actually are running the campaign
And yet people still want to believe a bunch of anonymous “senior advisers” over what Biden actually said. Pure wishcasting.
That’s not rigging an election, that’s just politics.
It’s literally the same thing Macron is doing right now to stop Le Pen’s fascists from winning.