Yes, that "average developers" part is the important bit. Not sure what your point is here. The parent was talking about their experience in porting C++ code

Yes, that "average developers" part is the important bit. Not sure what your point is here. The parent was talking about their experience in porting C++ code to Java, noting a performance improvement. In terms of performance, you don't use a language like C++ because it is going to be faster than everything else out there in all cases, you use it because you can eek out more performance than you can in using a language such as Java.