I remember reading about huge drama in japanese twitter and I believe there were even threads on this forum about Nasu inserting huge NTR subplot into Tsuhikime with Primate Murder, I believe it was like half a year ago when it was discussed. It reach top hashtags for like two weeks too.
And now it seems that Primate Murder was removed completely from Tsukihime world, he isn't part of DAA list anymore.
So it seems that Primate Murder x Altrouge subplot was destroyed? I guess Nasu decided to listen to fans this time and remove it completely. I guess it makes sense to keep PM in FGO, as it's NTR game anyway (unlike Tsukihime Remake, which is actually good, and even Ciel route was greatly improved since original and now features proper endings without Arc cucking Ciel).
Also apparently Altrouge is female now. Wonder how does she looks, as she was supposed to look like Brunestud in original Tsukihime, but she isn't Brunestud anymore.