I mean you're probably right in the sense that the peak of the Gauß-Distribution is probably shifting to the left. The absolute numbers are probably a different story. When more people get introduced to coding, more people are getting good and very good at it.

Think about sports. Are there more people that are bad at skiing in Austria compared to the Netherland? Yes (if you don't count the ones who never stood on skies). Are there more good skiiers in the Netherland compared to Austria? Absolutely not.