Visual Idiot is a notable name in the design community. It would be like stealing from Tobias Van Schneider or something. You can't get past people in the know.
But how did you even make the connection? I don't see the text "Visual Idiot" anywhere. And were you just browsing his js files? Or did the UI of the site feel familiar?
Ah, I just went to http://vaguelyexciting.com/. I'm assuming you recognized the moving dots/lines and made then connection yourself, then compared JS files to confirm.