But have any other lines been found? If not, then there is no evidence to suggest the content was cut super late in development as opposed to having some bare bones laid out then leaving it be.
The uploader of the sound clips is still commenting on the Mqusitor and Cullen thing but hasn't said if they are still looking. The clips (and therefore their tumblr) are in my first post, if you have a tumblr you can ask them if they are still looking in the games files.
Bare in mind that it isn't as easy like it was in ME1 or DA2, in those games you can do gender edits which allows you to hear the same sex (or opposite sex) dialogue in-game. Actually mining a games files for locked content is much harder, probably a lot more on frostbyte. Kotor 2's restoration content mod comes to mind. The game has sooooooooooooooooo much cut content still in the games files, but actually trying to mine it out and make it usable is a pain even for such an old game.
For all we know there could every single bit of dialogue for a romance between Mqusitor and Cullen for the whole game still in the files, all the way down to how Cullen thinks the inqusitors ding-dong tastes good. Idk. Just commenting that it could be a while.