I think it is closer to a 13 year old doing something that they have spent years practicing, such as a piano recital.
I mean how likely is it that "Hashtable/JS interpreter/JVM implemented in C" is going to be a big hit on HN? Not often. But since Go, JavaScript, and other insert new hotness language here are popular things somehow it's more interesting to retread old ideas with them. That's not the sign of a young master demonstrating his skill, it is the sign of an immature field that hasn't figured out how to distinguish what is new and important from what isn't.
It's unfortunate in particular for the people who do do these projects for fun or learning. These people have their work hijacked for a showoff culture's mutual backpatting.