They look similar at a glance (border-top + Calluna font), so he might have taken inspiration from yours, but doesn't seem to have used any of your assets - the styles are clearly different and based on the WP 'BlankSlate' theme.
(my personal blog had a top border like that a decade ago, when styles on the body were a novelty :))
(my personal blog had a top border like that a decade ago, when styles on the body were a novelty :))