"Hitler wasn't a Socialist. However, he used some of the ideas of Socialism, like collectivism and statism"
That is what a socialist is; collectivism and statism.The minor policy differences hardly makes them opposite.Coke and Pepsi are different brands but they are still colas.
"To summarise, Orthodox Socialism is egalitarian and anti-nationalist, unfortunately, it also requires collectivism and statism. Hitler accepted the last two, but rejected the first two, in favour of racism and nationalism. The USSR claimed to accept all four, but actually was also a racist cesspool. The USSR was not a proper Socialist country, nor is the PRC one. I doubt that there will ever be a proper Socialist society."
That is because the theory of socialism in all it's variants is wrong.If the theory doesn't work it is badly flawed.