Okay, my apologies for the snark, but this isn't exactly the completely open and "use it for anything you'd like and it's okay!" deal that it seems to be.

You can use it, but you'd better be aware that Naxos is the owner as far as YouTube's ContentID system is concerned. Use the music in a video and you'll have ads all over it with the money going to Naxos. Not exactly what I'd call open or public domain.