Might be so! But if thats the case, I haven't played against a single good Darius every time I went Singed then. Really mean it when I say I had no trouble against any Darius top. Easily outfarmed him every time and just stopped his damage with a good fling and glue.
I wouldn't get cocky on Singed though, a well timed hook and slow with an ulti after a few hits can do some serious damage. But I'm still not afraid of a Darius when I go Singed.
The last time I got counter picked by Singed top and was told by my team that I would only feed and bla bla bla, 7/0 in lane.
Singed is too easy to harass with the edge of Q, which is also the whole point. Using W or even E is very dangerous depending on what the Darius is planning.
On paper, the only way for Singed to win is to kite Darius, that's it. As soon as the Darius can outplay you by having you melee him when he's ok to do so, you're dead.
I'm not a good player but I play both champions top and really, while Singed wins if he can kite, if he doesn't he shouldn't win, ever.