I would agree. To me it looks they have made an easier way to create programs that process data in parallel efficiently and made it easy to use them from dynamic languages.

It's not so much "java script is as fast as C++", but "our system is a fast as C++ and you can use it from java script". They are using "Node.js" and "JavaScript" in title for the marketing angle if anything, because people don't use Node.js and JavaScript if they are trying to make parallel data processing programs.