I am reading You Don't know JS it says,

but despite the fact that JavaScript falls under the general category of "dynamic" or "interpreted" languages, it is in fact a compiled language. It is not compiled well in advance, as are many traditionally-compiled languages, nor are the results of compilation portable among various distributed systems.

So is it trying to say that JS compiled on Node.js

my another question is if Node.js is created with C++ then why do you we call it a JS platform/framework? Is it like PyPy? where Python compiler itself runs Python?

Any explanation/advice/guidance is appreciated. Sorry if I've not used any more technical terminology.