A sufficiently advanced technology is indistinguishable from magic. Though that's not the point, I just like that quote.
But I thought the smart phone was a dead giveaway that this is just a bit of fun/au. Though to play Devil's advocate are we just going to ignore the ICBMs that show up in the third act of most routes in Three Houses?
^I’m fairly certain they only appear in Claude and Rhea’s route (which are practically the same route anyway), along with a fair bit of surprising (but not unwelcome) dubstep. If you ever decide to replay the game and see for yourself, I’d recommend doing so with the Golden Deer, although you will have to bring someone in to fill that route’s yuri gap.
^^US Americans are the leading world champions in bizarre racial hang-ups, inane Twitter drama and crying wolf so the assumption is only too natural. (That bullshit's contagious too, sadly, on account of international US popular-culture hegemony.)
Frankly I would be greatly surprised if it wasn't Amerifats.