This person sounds very unwell. She or he likely feels very inadequate, their life is likely a mess and to make themselves feel better they are trying to create fake grandiose persona and assign fake qualities to themselves.

Sadly it’s obvious they don’t accomplish much by doing so, just making themselves look ridiculous and even more inadequate.

I know you said you are lucky not to have to communicate to this person but if you do have a chance, I’d recommend to let them know they should seek Professional help and focus on improving their life