I don't think his performance is the problem, it's just this specific song that has some weird vocal arrangements. That's the impression I get, but we will find out when the whole album is released.
Vocals are fantastic on that one. I've listened to Nevermore a few more times as well. It's definitely just a different route for him melodically. He's still got the pipes thankfully!
Stoked to hear the whole record! That song almost sounds a little radio rock. But still great.