Just that they can't (obviously).
I really love digital technology, I sometimes also love riding on the edge of it. In addition, even as a guitarist, I never aquired a sense for "mojo", analog snobbery or whatever it might be. So replacing analog with digital not only isn't new to me but even appealing (I'm using amp modeling for my live purposes since almost two decades by now, pretty much exclusively since around 8).
But the gist of that video is "any analog music device can be replaced by something digital and we've managed to squeeze it into this thinner than ever device". It's likely even meant to be somewhat funny or whatever. But it isn't. Not only because it's completely wrong but even because there's some sort of belief into that behind it. "We have our new session players, why would you keep that dusty piano in your home at all? And why even bother to learn playing it?"
As much as a logical (hah, there, I said "logic"al - I'm such a funny, funny person) thing all this might be, as much as I even may use it myself, it is my firm belief that AI was/is the worst to ever happen to music. Oh yes, it could be super useful in some areas, such as in education - but as it's mainly used for other things, I just loathe it. And a company praising it by even going beyond what's actually possible (an iPad isn't a replacement for an acoustic guitar just yet), regardless whether it's meant to be funny, futuristic or whatever, doesn't earn my respect. Add to this it's just cheap and tasteless by advertising video standards.