Dawntrail development started a long while ago, before SBI had their horrible reputation. Kind of hard to restart and rework the whole MSQ and development when you're about 6-9 months from launch date, much eaiser for SBI to say "just edit the credits out, and we'll not claim it." Plus, remember, extortion tactics. "Use OUR services OR ELSE." I've said in other post of mine, I'm fine with such consulting companies and such as a whole, as long as they do it right. SBI on the other hand, they are the worst. They are openly bigoted, violent, and downright corrupt.
Plus, from a "DEI consultant" standpoint, does it make any sense at all SBI wouldn't be involved? Dawntrail is literally about "DEI" Learning of others cultures, heritage, being diverse and inclusive of everyone (except one of course). Plus, when it comes to money and "sending the message", why on earth wouldn't they want to be involved in SE's largest most lucrative IP that has one of the LARGEST audience's in the world? It doesn't make any sense for them NOT to be involved, but it does make sense why they wouldn't want people to KNOW they were involved, do to recent public backlash at their... "practices".
I don't have a problem with a lot of things, but I DO have a problem with SBI specifically. When one of the employees openly admits she refuses to hire white people cause of skin color. When the CO-FOUNDER literally says publicly "If game developers say no, go have a cup of coffee, and TERRIFY THEM IF THEY DON'T GIVE YOU WHAT YOU WANT." (Which they did with Black Myth : Wukong. As soon as that developer said "No, i'm not hiring you", Kotaku wrote a hit piece slandering them as sexist.) Another tries to get a guy fired from his job cause they had a disagreement (Kris Kindred). There is tons of examples where they openly admit they hate white people, gamers, and use every mafia tactic in the book to get what they want.