I don't know why iTunes would ever bother translating anything (they are only trying to sell to JP people; neither of the albums I posted above are available on US iTunes)
If you check JP-only albums by other providers on iTunes they don't have any English data attached even if you force l=en i.e.
Epic -
https://itunes.apple.com/jp/album/id1289162079?l=en
King -
https://itunes.apple.com/jp/album/id1292519515?l=en
Aniplex -
https://itunes.apple.com/jp/album/id1295032056?l=en
Victor -
https://itunes.apple.com/jp/album/id1278258974?l=en
But all Lantis releases have English data regardless of whether they are available on US iTunes or not. Some examples from Oct 25 releases
https://itunes.apple.com/jp/album/id1295027624?l=en
https://itunes.apple.com/jp/album/id1295080994?l=en
https://itunes.apple.com/jp/album/id1295030631?l=en
(none of these albums are available on US iTunes)
Seems pretty clear this is a Lantis-specific thing and not an iTunes thing.
And the titles do match JASRAC (only talking about Lantis here; not some other label)
For example
https://itunes.apple.com/jp/album/id1268525435?l=en
iTunes provides "The World In My Fantasy" as an English title for track 2 (地球儀にない国). "WORLD IN MY FANTASY THE" is provided as an alternate title on JASRAC. And you can check any of the other songs on this release, all have matching a alternate title on JASRAC.