I cannot imagine a balanced, functional person consistently making up such absolutely mad lies, can you? I am not talking about the plagiarism and fake (?) qualifications, which obviously had a massive benefit to him.
I’m talking about the stuff like having run 600 miles, learning to read at 18, having been in a coma and had to relearn speech and walking, playing multiple sports at professional level and so on.
I can’t diagnose him but surely this behaviour is in itself pathological.
Yes I imagine if you spent a lot of time around him it would become obvious there was something far wrong with him. Perhaps mental illness is the wrong terminology - but as a PP said, certainly a personality disorder(or several).
But again, it’s his actual journey to this point that is most interesting to me. Especially knowing how hard it is to even get a lowly short-term lectureship or place on a research project.