I'm using ChatGPT to help me learn German. It is good, but as with all current AI it has a tendency to be very confidently wrong. This is especially true for more nuanced grammatical questions, such as "Why is this in dativ?" For that reason, I never feel I can fully trust it (and certainly wouldn't build a language-learning product around it). With that said however, it is a great addition to the various tools I use.

I think what your roommate is doing is fine. Being a native English speaker is a bit of a cheat anyhow. I very much appreciate the challenge of learning another language, so am not going to fault someone for using different tools to help improve their language. So long as the ideas are (relatively) original, the specific wording seems less important.