Unfortunately the Smart TV hacking community is not that active.
It is a bit more active than your links seem to indicate, but is not very well organized or easy to find.
Use https://cani.rootmy.tv/ to check recent status of rooting LG TVs models. Many slightly older, 2+ years old TVs are still rootable, due to this exploit from 2024: https://github.com/throwaway96/dejavuln-autoroot
Why was the original crosspost deleted? https://lemmy.world/post/25156749