This is a subject I've been investigating for a little while personally; and also one of the reasons why I really haven't done much regarding Code Vein matches or CRTs for a while. Basically, there's an issue with the current tiering of Code Vein, but it could go both ways (that is, lead to either an upgrade or a downgrade).
Currently, the verse gets it's 7-A rating via the Successor of the Breath having created the Ridge of Frozen Souls, which is confirmed in-game to be a mountain ridge. There are two problems with this.
1: We don't make 7-A assumptions for mountain creation feats anymore. Due to many of the values going from tier 8 upwards being nearly arbitrary, a mountain creation feat is generally not accepted as being 7-A unless it is explicitly calculated to be such. And outside of making assumptions through things like fragmentation values, there isn't any good, acceptable way of calculating a mountain creation feat. So this could easily lead to a downgrade, as mountain creation feats are typically far lower than 7-A.
2: However, here's a detail I borderline glossed over when I made the original 7-A upgrade thread. It wasn't a "mountain creation feat". It was a "mountain ridge creation feat". Not only did the Successor of the Breath create the entire ridge, but a mountain ridge is typically made up of many, many mountains in a chain. So, while a mountain creation feat would be considered far lower than 7-A currently, the feat itself is far higher than it has been depicted on the profiles due to having created a giant chain of mountains rather than a single mountain.
So in other words; we need to revise Code Vein's statistics. Problem is; I have no idea whether this would constitute a downgrade or an upgrade with the current information, and it'd be extraordinarily difficult to actually get a proper calc on this feat.
I've been wracking my head over trying to figure out how to treat and tier this feat, though I'm admittedly pretty much at a loss. So, I'm gonna leave this on here. Is there anyone still interested in the Code Vein verse who thinks they might have an idea on how to help out with this?