I should say that I could see someone who does a decent amount of in-engine work (nodes and their attributes, scenes, importing, handling some technical setup, basic layout/UI stuff, testing, particles/shaders etc) being called a developer/designer even if they aren't a programmer. Though I also think someone like that probably can at least do some very simple code, at least pasting enough together to get something like movement/projectiles/signals etc.

Again, said as someone who is closer to an artist (and hasn't made a game) who has tinkered with some stuff like that.