Maybe I'm out of touch with how it's used today, but self taught used to be someone that built things, W3schools was the closest thing to online courses years ago. If so I'd argue the modern usage is wrong though, a self taught mechanic is someone that tinkers with cars, a self taught electrician is someone there own cables, a self taught sysadmin typically fell into the role by doing stuff, a self taught investor has invested money. So I see know reason why a self taught developer shouldn't be someone that's built software.