Nobody denies that someone like Matteo is extremely privileged to have been born in the wealthiest country in the world, attend one of the best public schools in that country, and therefore be exposed to a research program that connected him to the Caltech professor that made his work possible.

That privilege may well be a necessary condition towards being able to publish a paper that shows extreme computational sophistication for a high schooler (and indeed, IMO would be a middle-of-the-road graduate-level paper). But it's certainly not a sufficient condition, as you seem to be implying when you say that blindly giving a kid $10-$20k is "effectively the same" as having Matteo's background. If you just handed $20k worth of GPUs to a rich dilettante child, they would not be able to achieve anything close to what Matteo accomplished.