Use several kinds of evidence: current job postings, public occupational information, relevant licensing requirements, and accounts from people who know the work. Each source answers different questions, and none should be treated as a complete picture by itself.
AI can help organize what you find, but verify requirements and dates against the originals. Pay attention to location, experience level, and the difference between a typical description and a specific opening. Keep a short list of unresolved questions so your research leads toward clarity instead of becoming an endless collection of links.