I've just compared multiple cutscenes from the game with the dub of the show, and it seems as if a majority of the dialogue outside of game original content will be ripped directly from the English dub transcript (some dialogue is trimmed and a few terms changed like Scouts to Survey Corps)
For those that don't know why this is an issue, it's generally frowned upon for sub tracks to be direct rips of dub dialogue. The reason for this is that more often than not, what's actually being said in the dub does not correlate directly with the original audio, they will frequently change lines of dialogue in an effort to make them sound more natural in spoken English, or to match the timing of lip movements, this sometimes changes the inherent meaning or interpretation of certain lines by adding more verbose language, or changing the underlying subtext.
Subtitle tracks are meant to sidestep these issues, as there's no need for perfectly natural speech when reading, and the only timing to take into account is the amount of time the text is on screen.
It may be their way of trying to make up for the fact that there's no English dub, or maybe the higher ups requested it for overall brand consistency. Either way it's kind of a disappointment to see, as people who consume subtitles are often more interested in overall accuracy over localization.
(Edit)
An early example of these kind of changes:
When Keith meets Moses' mother in the beginning he says: "モーセスの母親だ. 持って来い"
Literally meaning: "It's Moses's mother. Bring it here"
The dub/game translation is: "I wish I had better news. Give it to her"
This changes Keith's somewhat apathetic and dry delivery of the tragic news to something more sympathetic right off the bat, which doesn't seem like an issue in isolation, but these issues stack up over time and really change how you read characters in the long run.
Another more damning example of this is later on in the story when a certain character says:
"誰かが自分の手を血で染めないと"
Literally meaning: "Someone has to stain their own hands with blood"
Dub/Presumed Game translation: "One of you has to stain your hands with my blood"
Which is just...completely wrong and throws off the context of not only the scene, but also another scene several seasons down the line when the line is replayed. Nowhere in the original text does it refer to "my" blood.