Samsung made two different variants of the Galaxy S8 line - one with their own Exynos processors (the good one) and one with Qualcomm processors (the shitty ones).
Only Exynos devices have LineageOS. I guess that’s why they’re not listed as officially supported.
The same developer also made newer releases already. It’s rock-solid and everything works.
For good camera support I recommend using IDans Gcam mod (Mod8.3b_IDan_v4.7_test2.apk). You can enable HDR and three different moded (Day, Night and Dark), the photo quality is mostly as good as stock, if not even better. It’s a bit buggy when trying to view the photos inside the camera app so I have to use the Gallery a lot, but that’s just a minor nuisance.