TechnicalBarbarity
Poser Disposer
I mean, I don't hear very many heavy metal bands that were like "we have to copy Deep Purple!" whereas Sabbath spawned whole genres.
You do realize that they inspired just about every heavy metal band that came out of the UK, right? Some of their songs, including the one you love ripping so much are considered to be amongst the first "speed metal" tracks of all time brosef. They were one of the fastest, most aggressive and most energetic groups of their time. If you cant hear their influence in most 80's heavy metal than i don't know what to say.
I don't see how Black Sabbath - Black Sabbath is anything less than 100% heavy metal.
Like you said, that track is pure metal. I don't think anyone is going to question that.