It uses the lightline.vim pluging and displays the filename on the status bar.
The great thing about using the amix/vimrc is that this plugin takes care of most of the customization, its very stable, and has been tested by 1000s of people, as you can check by looking at the number of github stars.. and the infrequent issues.
Its also updated quite frequently.
P.S.: not the author of either of the plugins.. just a fan :)
Then I could put something like set statusline="%f%m%r%h%w [%Y] [0x%02.2B]%< %F%=%4v,%4l %3p%% of %L" in my .vimrc file and after restarting my terminal the statusline displays properly.