I have it directly from Bandai that the devs working on BU did not have a part in developing BO. It sounds like you might be eager to spot some kind of conspiracy, but Neowiz's involvement in both projects and the reputation of Bless Online are common knowledge. So is the new dev team lineup.
When BNEA partnered with me my 1st condition was that I will not be censored. If you've seen my content you know I can be very unkind about this game. I have no interest at all in covering anything up. When BU devs mess up, I'm among the first to point a finger. Honestly, my videos slamming the game sometimes get a lot more views and new subscribers than the ones praising it, but I don't lean into that and trash the game just for likes. I do my best to keep my content objective.