Writing his own biography is no more or less narcissistic than your thinking anyone on the internet cares about your opinion on his writing his biography.

Lots of people have personal web sites of their life's accomplishments, they call them "portfolios". Lots of people have an online account of their day-to-day activities, they call them "blogs", "tweets", and "status updates".

What Martin Manley has done here is no more or less "self-obsessed" than what you and I do every single day, he only presents it in a manner slightly askew to that with which we are accustomed.