This article is a mixture of well known old facts and fantasy.
Hitler´s relatives in USA - thats nothing knew, you can read this for decades in books about Hitler family.
"'All Hüttler living in the Waldviertel region are distant descendants of Hitler, although many of them do not even know, as it was their parents or grandparents who changed the name and never told them,' said Vermeeren. " - nonsense. Hüttler is a common name in Waldviertel, there are lots of them who aren´t related to Adolf. Some may have the same ancestors as Adolf, but others not. And the existence of Hitler relatives in Waldviertel is also a well known fact and nothing new.
If his name was Adolf Schmidt, all Schmidt in Germany would be descendants of him?