I was just looking up the Cantai thing you've been talking about.
I don't know that it's "AI" in the way that Suno and the others are AI. It seems like a more advanced version of Noteperformer and sample-based synthesis that allows for cloud rendering.
But the main distinction is that it can actually play back the sheet music you give it. Music-generation platforms like Suno can't so as expected, OP was full of ѕhіt
I do think that if AI stays around and gets to the point that it can actually realize an accurate orchestral (or other) mockup from MIDI/sheet music, it will be over for sample library developers.
At least until AI collapses under its own weight, which I still think is probably inevitable.