You imply his ideology was socialist in nature (or at least part of it was), and then contradict that statement in your second sentence stating he essentially used the socialist party to gain enough power to the point where they were no longer needed.
I don't think you understand the definition of ideology.
Simply claiming to be something, doesn't make it so. The reference above to the Democratic People's Republic of North-Korea is a good example, as are right wing extremists claiming to be born again Christians, yet follow none of the basic tenants of that religion. Socialism for Hitler was nothing more than a vehicle, not an ideology. The majority of scholars agree that his leanings were definitely right wing, although he often attacked both parties when they strayed from his personal ideology.
Any civilization today has aspects of socialism. it is nearly impossible to have a structured society without some form of body politic which actively promotes social services that the public recognizes are necessary for basic services. The very nature of civilization requires aspects of socialism to thrive.
It is simply the degree to which they think the government should control things that defines 'socialism'.