I get the thematic connection but I feel like Blind Guardian is an institution whereas the Diggy Diggy Hole band is perhaps in a different league with a more selective core fan base and a song that has novelty appeal.
No offense to dwarf metal fans intended.
Their rendition of Diggy Diggy Hole made it to dwarvish rock anthem... but they've got a lot of other material that is dwarf themed.
They do speak to more of the gamer culture... for example Rock and Stone https://youtu.be/8ZXBm1NXBaI - there's a lot of other dwarf rock.
Consider "The Breed of Durin" - who preformed it? https://youtu.be/dV51_xsV4uI
Other than seeing "Wind Rose" and knowing Blind Guardian discography, you'd likely have to listen carefully to identify if this was Blind Guardian or Windrose. https://www.youtube.com/watch?v=UIhpnUMTxak&list=OLAK5uy_m3G...