No, because, like I just explained, there is a notable difference between black hair and brown hair. One is European, the other is non European. Never is hitler described as having black hair.
Today, I saw another reference to Hitler's "dark hair" on what is supposed to be a pro-Hitler website by a pro-Hitler commenter. "It makes me wonder why Hitler, Goebbels, Himmler, Hess, Speer etc all had dark hair." -HdP Neither Hitler nor Himmler had dark hair, the other three did. Too many...
carolynyeager.net
Hitler's hair was medium brown; Himmler's hair was a light shade of brown [or "dirty" blonde?]. Light to medium brown is probably the most common hair color among ethnic German people (this includes Austrians). From there it goes to lighter and to darker in probably equal numbers.
In addition, Hitler, Himmler
and Hess had blue eyes.
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If you can't see the difference I have no idea what to tell you.