That’s the hallmark of a pathological liar, they lie oftentimes in situations where it would be easier to simply tell the truth.
It over time becomes their “comfort zone” so they just out of sheer habit and mental easement lie constantly about everything ranging from the very serious to the most benign things.
The guy is a sociopath.
Lying like Biden does, always telling tall tales and pumping himself up, is also a sure sign of someone who has an inferiority complex.
In Biden’s case I’m sure of it.