I have an 11-year-old son who likes rap music, the kind my 40-year-old ears can't take more than 3 minutes at a time, if that long. When I was his age, I liked it as well.
Would I have him in videos such as these? Probably not. That's because our lifestyle and outlook are miles apart from that being experienced by Lil Poopy. (The surest sign he's only 9-years old is that he allowed someone to give him the stage name Lil Poopy. Doesn't that name make you just want to giggle? A little?)
Is this a case in which the state should step in? Not from what I've seen, though I've only done a cursory review of a couple of his videos. Of course, when the state gets a report about possible child abuse or neglect, it has to look into the case. But if they don't find anything more damning than the "Coke is not a dirty word" video, they should stamp it unfounded and move on.
One of the videos in question can be found on this website.