Site's registered to a Courtney Nuckels. She's co-authored 4 teen novels, all "published" via Amazon Digital Services. Her bio on Amazon states that she is or was a middle-school teacher. No mention of any previous publishing experience. That would be enough for me to give them a pass.
Their "rating" system makes me gag, honestly. "He hit a home run" is a "Level 1" naughtiness phrase? Really? Do people even still use the "first/second/third/home" euphemisms for fooling around? What if it's a book about a baseball player? And they're basing it on a paper put out in 2000 by the BBC and the British Broadcasting Standards Commission? That makes me both give them a pass and a strong desire to hack-up a hairball on their foot. (ETA: That sounds wrong--it's not because it's based on BBC/BSC standards; I'd dislike it as much, if not more, if it was based on FCC standards. Using 13 year-old standards from broadcasting, though? That's just odd.)
Also adding: I don't know about the rest of the images yet, but the "Angel" image they've "been working on!" is from a royalty-free, stock image site. The only "work" they did on it was to draw a circle around the face and color it yellow.