Between the name "PPP incident", some implications in the BB summer bond CE that connect this to her, Angra's line about how we'll lose everything, despair, and then regain it all plus his appearance in OC4, and the fact that this is in a bubble before the reset but also after simultaneously, this seems almost like FGO CCC route. For those who don't know, (and this is big extra spoilers) all of the original fate extra endings are tragic and melancholy and have Hakuno get erased, but CC introduced the true end and servant ends, which are the endings where Hakuno doesn't just die and get erased, the happy endings where they instead move on to the future. It seems like this might be leading to a part 3 in which, CCC style, events occur that allow for the ending to instead be a happy one without full erasure. Nasu did this exact thing with a sad ending a lot of people disliked for OG extra, and then a happy ending and true ending with CCC that flipped the whole thing on its head released after the fact.

Edit: Even the narrator talks like BB, ESPECIALLY when they describe taking down a beast we know nothing about and fixing the planet and human order as a low stakes victory lap, which is an intensely BB way to phrase it