It's hardly similar. Johnny_S is legit, he has made themes for me from scratch. The 1.8 dark theme is slightly newer, as it's for 1.8. I believe Johnny made this theme a while ago and just made touch ups here and there as time went on. The only thing I can see that is kind of close to the color scheme.
As for this topic, yes this theme is made custom with lots of features wanted by Philly from Johnny to give us a better forum to browse. I actually really like this theme, especially how you can edit the color to your liking and the width.