Scammers have much more success phoning Granny and claiming that they are Windows Support or "The Internet" and simply asking for what they want. There are far easier ways to con than this, and for very sensitive scams where you need spear phishing of this order, then this will fall flat on its face. "Good enough" doesn't quite cut it when it comes to this.

And fwiw, I think the intonations are actually impressively learned and not random. Trump's odd yet distinct intonations are capture quite well in their samples.