we're at basic knowledge level, if your RAG imply some of it, you can get bad result too. Anyway, would you use a model who makes this nonsense response or one that doesn't? I know which one I will prefer for sure...
If this was better at specific RAG or coding performance I would absolutely, certainly without a doubt use it over a general instruct model in those instances.
People getting so used to being manipulated and lied to that they don't even bother anymore is a huge part of the problem. But sure, do what suits you the best.