Don't trust it. Lots of people have varying advice on how to raise a roo (give him lots of love vs give him the cold shoulder). I don't have any firsthand experience, but I do know you won't see the final product till he's sexually mature. I had a sweet hen turn on me the moment she started laying eggs, taking on the role of the rooster. It was literally overnight! She put a hole in my hand while I was handling another bird.
Fingers crossed for you though. d'Uccle males are very striking and it would be nice to have a cockerel that can't do serious damage with his tiny little legs!