Something I've recently started seeing, maybe even an emerging #4 is AI generated translations. You could have someone very intelligent, making well written subject matter expertise. Or just someone who has valid thoughts they wish to express to the world in a language more of a common tongue than their own.

Or on the other end you could have someone who wrote a sentance or two in their language and had some combination of AI generation and translation algorithm bloat it out.

In both cases you will get something that can look right and well thought out or explained, but probably will have at least some of the AI slop signs present. I don't know what the solution is for this type given claims Google Translate has started to do this kind of translation for people. An AI translation is probably just as prone to hallucinations as any other AI, but it probably will look more natural to readers than a direct translation.