Well, I see some comments on Youtube like "Wow, I've never listened to this type of music, but I like it, what you guys can recommend to listen to?", so he'll probably gather some audience. Though his solo stuff isn't so strong, so this guys will probably end up exploring Avantasia and Masterplan and that stuff. Maybe Allen/Lande too.
It's for League of Legends, quite a famous MOBA-type game, I think it's the most popular in the genre now. There are big international cybersports tournaments being hosted up for this game and all these things. I think it's a good decision on his part to participate in this.
The song is alright too, nothing spectacular, but a nice introduction to the genre for non-metal listeners, being tied up with the game and its characters.