What you wrote was incorrect to the point of being stupid. Clearly you don't understand what demonetization means because it is extremely relevant. The music rights holders either get paid or they don't. In this case, they get paid (except for short fair use clips) but you incorrectly referred to them as unpaid. Thats not a matter of opinion, and the definitions of paid and unpaid are pretty fucking clear. He uses the music, arguably to advertise his website, the music rights holders get paid the money YouTube is not paying him, and you say it could "easily be argued" as "unpaid advertising." Yeah, I guess it is easy to argue anything if you ignore facts and the meaning of basic words, but anyone trying to make that argument is not going to look very honest or intelligent. They get paid by YouTube, there is no reasonable debate about that.
So what else do you want me to comment on? That Rick uses music to indirectly advertise for his book and lessons? Seems reasonably accurate. That the rights holders of that music should get paid if he uses more than a short clip? Yep they should and do.