Is that what they call “steam punk”??
Nope. The Wintergatan Marble Machine is more steam punk (steam punk is a look and style, not a musical genre.)
https://en.wikipedia.org/wiki/Steampunk
What Dragonforce is... is rather unique. Closest genre to it is speed metal. Something else relatively new is symphonic metal.
https://www.youtube.com/watch?v=rVVTiG9UgnE