You know that's basically an argument for censorship, right? That if you make content children enjoy then you're also not allowed to make adult content either in case children find it through looking you up?
Also, it's hardly unprecedented. Rebecca Sugar (creator of Stephen Universe) made Ed, Edd, and Eddy yaoi before getting hired by Cartoon Network. Ed, Edd, and Eddy was in turn made by Danny Antonucci, who before making it also made adult-centric cartoons that are extremely inappropriate for children.
Weirdly enough, Gooseworx (somehow) isn't even the first animator to make trepanning content. Maxwell Atoms (creator of Billy & Mandy) made a short animated film about trepanation while in college
and even used the same characters he later used in his show. It would be easier for me to list the children's cartoonists who aren't wanton degenerates, honestly.