In this context I think they are interchangeable and that many people do interchange them, whether you agree with them or not.

It's fine to disagree, I don't think you're "wrong", and I don't think I'm "right" either. We just have different perspectives and definitions of words, and that's ok.

I think the more important thing is understanding the intent of the person speaking, instead of just trying to win an argument, as that's derailing the conversation/topic anyways. And in this context, all I was trying to convey by using "by hand" and "from scratch" was the notion of coding without using an LLM.