About two month ago: https://en.wikipedia.org/wiki/Jacobian_conjecture

We have absolutely no idea if this was a brilliant breakthrough or not. They haven't released any explanation of how it was found. A problem being old and prestigious does not mean its solution is automatically a brilliant breakthrough.

That’s just a counter example I can check by hand with almost zero background.

Wiles’s proof will remain a mystery to me.

Come on, you can't compare that with Wiles's proof.

Still unsolved for 87 years.

Meaningless on its own.