No, the Kinks songs came up as well.
It really depends on how one thinks of heavy metal. Som e swear before Zeppelin there was none. Other refer to Cream, or further back the Yardbirds. But the Kinks, specifically those two songs (one you mentioned and You Really Got Me) are often cited as being even before anyone else.
I don't buy the Duane Eddy view, and I would have to say you are probably correct on the acknowledged first.