I specifically remember scouring the source code on the main page... Waaay back in September of '99, I was teaching myself HTML by observing the code on other pages. I read the source of TMK's main page and saw the message, and so I tried finding the secret page on the side while I learned HTML. Obviously, I still haven't found it...
I did learn one important thing from Deezer's HTML though- make sure your code is readable and well organized! ; )