If wasn't a socialist than what was he?
His party was called "National SOCIALIST Party".
So, what's your point?
East Germany's official name was "German Democratic Republic".
Russia's ultra-nationalists call themselves "Liberal Democratic Party".
Portugal's major conservative party is the "Social Democratic Party".
Denmark's most important right-wing party is the "Venstre" (= "the Left").
That reminds me of a Conservapedia article that used the Australian Liberal Party as an example of a party that is liberal.
If they meant liberalism as economic liberal and classical liberalism, so the French-European meaning of the word, then they're correct. But I somehow doubt that they thought of that, knowing their low IQ level.