Possibly but IMHO, it's more of a delusional disorder. I believe he truly believes what he says, which is the difference between a liar and a mentally ill person.
Trump's worst enemy is himself and Biden's best campaign strategy is to let Trump be Trump.
Im not so sure anymore, that used to clearly be the case, but now he just sticks to the script, he clearly does not even understand what he is reading... and wont take meaningful questions, especially follow ups. I dont think he is following them. Thats why they told Fox to cut away.