I think I see his point. All programming languages are very similar in their code: once you've picked up the nuances and the basics of the syntax coding in it

I think I see his point. All programming languages are very similar in their code: once you've picked up the nuances and the basics of the syntax coding in it is easy enough. But "creating" (I think that's the wrong word personally; but cant think of a better one) in a specific language requires much more in depth understanding of how it works (for example how a compiler constructs your C program, or how a Javascript engine runs etc.).