He's not performing well. Stop reading the polls. He barely campaigns, his running mate barely campaigns because, when she does, people ask 'where's Joe?' He's given up Florida, barely got any ground game there and when either of them show their face down there, they're usually chased out by angry Cubans and/or Venezuelans. When he shows his face anywhere else it's usually on short notice for extensively vetted press events or else, if he does announce ahead of time that he's going to be somewhere, he's beset with hecklers who usually outnumber the actual supporters.
Now, we'll see who's lying come November 4th, but I have massive doubts that Sleepy Joe has anywhere near the level of support the media claims he does. Remember, this is the guy who came 5th in New Hampshire. Usually whoever wins Iowa or New Hampshire (or both) wins the party nomination. It should be Bernie or Bootyblaster. Instead they gave it to Joe, who came 4th and 5th respectively. Nobody wants him.