yes, the level of serving is way lower than on the main tour but still it's a great achievement for someone who couldn't break serve to save his life. Will do his confidence a loads of good.
On the other hand, I'm sure there are many challenger players who have a better serve than Seppi, Chela, etc. And it's not all about serving, those breaks surely came with some good baseline play.
Ivo Karlovic has the distinction of simultaneously having the best career service games won percentage (91), and the lowest career return games won percentage (9) among players having played 200 matches (since 1991).