Browsing through the comments a bit, I don’t really see them fetishizing it as even close to children. They just happened to be into petite women, the smaller the better. On the opposite extreme is stuff like the BBW fetish people who want the woman to be as large as possible.

There are definitely people out there who are probably looking at them just because it’s as close as they can legally get to teen, but I’m not really seeing much of that in that particular community at least not out in the open. It’s definitely possible to be interested in extremely petite bodies without it having literally anything whatsoever to do with any potential similarities to underage women.

If I had to guess it’s probably mostly just people who like being in control, the idea of an adult partner who is so small that you can literally pick them up with ease and use them like a toy. I found a decent number of comments that seems to be on that sort of track.