It seems to me that the “With Bonus Tracks” phrase, if it belongs anywhere, belongs in disambiguation. But I did a search, and I see several releases with some form of this phrase added to the title as ETI, so I thought I’d ask before changing it.
You are correct. That should be in disambiguation as it’s not on the cover art. All lowercase as well. When you see things like (deluxe edition, 20th anniversary), etc in the title it should be somewhere on the cover art, not just on the store front name.