The watermark is noticeably more readable in the Facebook image I linked though, and it does say photography (even there it is somewhat blurred though, so assuming it was actually clear in the original source that copy is a few recompressions along the chain).
The dates of the other sources however are what really convinces me it’s not AI. After all, who was doing good quality photorealistic AI image generation in 2021?
I think the main problem with searching for fediverse posts is not that they’re not indexed but the lack of a singular tag to append when you want to search for them. To search for reddit posts it was easy because you could put in your keywords and stick ‘reddit’ or ‘site:reddit.com’ onto the end, but now there’s too many domains to keep track of and you can’t rely on appending ‘lemmy’ pointing a search engine towards all Lemmy instances, let alone kbin/mbin instances.