Pretty much he has always been a huge liar.
I don't know if he is stupid enough to think we believe everything he says, or if he thinks we're stupid enough to just believe whatever he says.
He reminds me of a guy I worked with once. Always constantly lying. Talk about all his hot rods he owns, he developed drones for the army, how his uncle was an astronaut that died (the astronaut that died did have the same last name but they were spelled different), one day his brother died from an od then next week his brother is an undercover cop, talks about being a cop (when he was just a jailer), when he quit he would tell one person he was going to be a big shot maintenance person for the post office then tell someone else he was going to be a maintenance manager for Dave and busters because the owner is his friend then tell someone else he was going to be a maintenance director for FedEx, he has millions from his stocks and it was like that every day.
Biden is like a kid that runs into a room of adults and starts lying because he has nothing to say but really likes the attention he gets from the adults.