I obviously don't have one, but presumably there's a fan header that they didn't use and didn't bother to remove the reference from the bios in case someone decides to use it...somehow... for some reason.

idk, but a bios setting for fan speed isn't actually indicative of a fan.

edit: could just be a really roundabout way to increase TDP

Same image as used on their laptop https://starlabs.systems/pages/starbook

The Hyper-Threading setting is also present even if Intel N200 doesn't have it.