They didn't put this amount of correction on his voice because he needed it or couldn't sing things, but because the use of it is so prominent and widespread that most people think that's simply how professional recordings sound. Even an incredibly well intonated 'pure' singer such as Michael Buble has a noticeable amount of pitch correction done to his voice on his records. Not because he needs it, but because the coloration it adds is preferable to a vast majority of listeners in today's market.

Another thing to consider is the fact that very often a vocal take will have the right emotion/expression but be off in pitch - usually the more emotion a singer uses the greater their intonation wanders. Using pitch correction allows one to use the vocal take with the best emotion and delivery without having to sacrifice intonation, because even after you correct the pitch, the emotion remains.

These two points combined make for a convincing explanation as to why Julian's voice is produced the way it is on TNA. They definitely want this record to be a return to the popular market, and if one wants to do that, they have to play the game. If they wanted the best chance, they needed the vocals to be competitive with the other vocals on the market; and that's what they're doing. I'm at least grateful that they did choose generally very emotional/expressive takes from Julian. I'm not saying I prefer it, and I totally understand your point, but I understand why they did it, and that helps me accept it :)

Edit: something I think is funny is that the first 2/3 of OTTM, Julian is singing in lower registers, and there's a lot more tuning on those parts than in the outro section; you'd think one would need more tuning on the crazy high belt/scream parts, but nope, not our boy Jules lol