Not remotely true in my estimation. I don't really speak Norwegian, but I do speak Swedish(which means I mostly understand Norwegian as they're very similar). Every model I've tried speaking Swedish to does it perfectly. I'd be surprised if the same isn't true for Norwegian already

different models have been very different in this way.. almost ten years ago the French made a very large effort to capture languages.. the release notes I read at the time IIR had quite a few languages from South Asia / India, and in Africa. The language that was prominently missing was German IIR. I cannot say for the 2025-2026 models since so much has happened.. but models are not equal.