> solving multiple previously unsolved Erdős problems.

So what?

Machines have solved tons of unsolved problems in mathematics. That's not a proof of intelligence.

If you brute force a solution, we congratulate you on your effort.

If you stumble into a solution, we congratulate you for being lucky (if we can distinguish)

If you find a unique solution that no one else imagined, we congratulate you on your intelligence.

These are categorically different things and the difference matters. It's the whole distinction. Though in the real world success usually requires all three (and more), complicating evaluation.

When we're talking about intelligence you can't distill it to "getting the answer". If you do then I'll direct you at an abacus, a calculator, a watch, or google search if you want to look at super intelligence.

  > natural selection did it

Did what? Gradient descent? If that's the argument, you need to read more