Mentally ill is much different from stupidity and dishonesty.<quoted text>
Now that looks a lot like evidence. Maybe he is just stoopid?
The pathological liar actually believes their fabrications are the truth.
"There are such unfortunates. They are not at fault; they seem to have been born that way. There are naturally incapable of grasping and developing a manner of living which demands rigorous honesty. Their chances are less than average. There are those, too, who suffer from grave emotional and mental disorders." Public Domain