Haha I think it's fine. I think its kinda cheeky answering you so literally, giving it an actual place to fit into :).
I don't doubt it can do, like, Wikipedia type classification ok, but that's not like really getting to the substance of anything! And, either way, its not like there is one decided-upon hierarchy of concepts like this people consciously work within. This is a fine picture to some, but others might contest, perhaps, that Meta-Ethics is the "study of moral thought, language, and properties." What is "moral language" anyway? Why is it meta relative to Moral Philosophy writ-large? Or perhaps one might argue that we need to think of meta-ethics as a sibling rather than child. The whole discipline is a mess of different thoughts and possible rebuttals and grand intellectual overturnings that will not be captured here. Maybe just try pasting that back into the prompt and asking "what's wrong with this picture?".
But like I said, its fine in that its fairly comparable to Wikipedia for utility, (with IMO a worse interface, but I get why people like it more).